Which of the following is not a branch of statistics?*
a) None of the above
b) Inferential Statistics
c) Descriptive statistics
d) Industry Statistic

Insert the following customer into the CUSTOMER table, using the Oracle sequence created in Problem 20 to generate the customer number automatically:- 'Powers', 'Ruth', 500.

Modify the CUSTOMER table to include the customer's date of birth (CUST_DOB), which should store date data. Alter table customer add cust_dob date; Modify customer 1000 to indicate the date of birth on March 15, 1989.Update customer set cust_dob = '15-MAR-1989' where cust_id = 1000;

Modify customer 1001 to indicate the date of birth on December 22,1988.Update customer set cust_dob = '22-DEC-1988' where cust_id = 1001; Create a trigger named trg_updatecustbalance to update the CUST_BALANCE in the CUSTOMER table when a new invoice record is entered.

CREATE OR REPLACE TRIGGER trg_updatecustbalance AFTER INSERT ON invoice FOR EACH ROWBEGINUPDATE customer SET cust_balance = cust_balance + :new.inv_amount WHERE cust_id = :new.cust_id;END;Whatever value appears in the INV_AMOUNT column of the new invoice should be added to the customer's balance.

Test the trigger using the following new INVOICE record, which would add 225,40 to the balance of customer 1001 : 8005,1001, '27-APR-18', 225.40.Insert into invoice values (8005, 1001, '27-APR-18', 225.40);Write a procedure named pre_cust_add to add a new customer to the CUSTOMER table.

Use the following values in the new record: 1002, 'Rauthor', 'Peter', 0.00.

CREATE OR REPLACE PROCEDURE pre_cust_add(customer_id IN NUMBER, firstname IN VARCHAR2, lastname IN VARCHAR2, balance IN NUMBER)AS BEGIN INSERT INTO customer (cust_id, cust_firstname, cust_lastname, cust_balance) VALUES (customer_id, firstname, lastname, balance);END;

Write a procedure named pre_invoice_add to add a new invoice record to the INVOICE table. Use the following values in the new record: 8006,1000, '30-APR-18', 301.72.

CREATE OR REPLACE PROCEDURE pre_invoice_add(invoice_id IN NUMBER, customer_id IN NUMBER, invoice_date IN DATE, amount IN NUMBER)ASBEGININSERT INTO invoice (inv_id, cust_id, inv_date, inv_amount) VALUES (invoice_id, customer_id, invoice_date, amount);END;

Write a trigger to update the customer balance when an invoice is deleted. Name the trigger trg_updatecustbalance

2.CREATE OR REPLACE TRIGGER trg_updatecustbalance2 AFTER DELETE ON invoice FOR EACH ROWBEGINUPDATE customer SET cust_balance = cust_balance - :old.inv_amount WHERE cust_id = :old.cust_id;END;

Write a procedure to delete an invoice, giving the invoice number as a parameter. Name the procedure pre_inv_delete.

CREATE OR REPLACE PROCEDURE pre_inv_delete(invoice_id IN NUMBER)ASBEGINDELETE FROM invoice WHERE inv_id = invoice_id;END;Test the procedure by deleting invoices 8005 and 8006.Call pre_inv_delete(8005);Call pre_inv_delete(8006);

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Let f(x, y) = x2 - 3xy - y2. Therefore, we can compute ƒ(5, 0), f(5, -2), and f(a, b) as follows; ƒ(5, 0)

When we substitute x = 5 and y = 0 in the equation f(x, y) = x2 - 3xy - y2,

we obtain; f(5, 0) = (5)2 - 3(5)(0) - (0)2

f(5, 0) = 25 - 0 - 0

f(5, 0) = 25

Therefore, ƒ(5, 0) = 25.f(5, -2)

When we substitute x = 5 and y = -2 in the equation

f(x, y) = x2 - 3xy - y2,

we obtain; f(5, -2) = (5)2 - 3(5)(-2) - (-2)2f(5, -2)

= 25 + 30 - 4f(5, -2)

= 51

Therefore, ƒ(5, -2) = 51.

f(a, b)When we substitute x = a and y = b in the equation f(x, y) = x2 - 3xy - y2, we obtain; f(a, b) = a2 - 3ab - b2

Therefore, ƒ(a, b) = a2 - 3ab - b2 .

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The critical value of F is 3.24.

To find the critical value of F, we need to consider the significance level and the degrees of freedom. For the F-test comparing two population means, the degrees of freedom are calculated based on the sample sizes of the two populations.

In this case, we are given a sample size of 50. Since we are comparing two populations, the degrees of freedom are (n1 - 1) and (n2 - 1), where n1 and n2 are the sample sizes of the two populations. So, the degrees of freedom for this test would be (50 - 1) and (50 - 1), which are both equal to 49.

Now, we can use a statistical table or software to find the critical value of F at a 5% level of significance and with degrees of freedom of 49 in both the numerator and denominator.

The correct answer is Option c.

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1. No, The corresponding function is not one-to-one

2. Yes, The corresponding function is one-to-one

3. Yes, The corresponding function is one-to-one

4. No, The corresponding function is not one-to-one

5. Yes, The corresponding function is one-to-one

6. Yes, The corresponding function is one-to-one

The cosine function (cosx) is not one-to-one over the given interval because it repeats its values.

The function h(x) = |x| + 5 is one-to-one because for every unique input, there is a unique output.

The function k(t) = 4√t + 2 is one-to-one because it has a one-to-one correspondence between inputs and outputs.

The sine function (sinx) is not one-to-one over the given interval because it repeats its values.

The function k(x) = (x - 5)² is one-to-one because for every unique input, there is a unique output.

The function [tex]o(t) = 6t^2 + 3[/tex] is one-to-one because it has a one-to-one correspondence between inputs and outputs.

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The proportion of the labor force that was unemployed very long-term in January 2019 is 4.1%.

Given:

Labor force participation rate = 62.3%

Official unemployment rate = 4.1%

Proportion of short-term unemployment = 68.9%

Proportion of moderately long-term unemployment = 12.7%

Proportion of very long-term unemployment = 18.4%

To find the proportion of the labor force that was unemployed very long-term in January 2019, we need to calculate the percentage of very long-term unemployment as a proportion of the labor force.

So, Proportion of very long-term unemployment

= (Labor force participation rate x Official unemployment rate x Proportion of very long-term unemployment) / 100

= (62.3 x 4.1 x 18.4) / 100

= 4.07812

Thus, the proportion of the labor force that was unemployed very long-term in January 2019 is 4.1%.

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The Question attached here seems to be incomplete , the complete question is:

In January 2019,

⚫ labor force participation in the United States was 62.3%.

⚫ official unemployment was 4.1%.

⚫ the proportion of short-term unemployment (14 weeks or less) in that month on average was 68.9%.

⚫ moderately long-term unemployment (15-26 weeks) was 12.7%.

⚫ very long-term unemployment (27 weeks or longer) was 18.4%.

Based on these statistics, what proportion of the labor force was unemployed very long term in January 2019, to the nearest tenth of a percent? Note: Make sure to round your answer to the nearest tenth of a percent.

Slope is -0.2

Given points are (1, 3.5) and (3.5, 3).

The slope of the line that passes through the points (1,3.5) and (3.5,3) can be calculated using the formula:`

m = [tex]\frac{(y2-y1)}{(x2-x1)}[/tex]

`where `m` is the slope of the line, `(x1, y1)` and `(x2, y2)` are the coordinates of the points.

Using the above formula we can find the slope of the line:

First, let's find the values of `x1, y1, x2, y2`:

x1 = 1

y1 = 3.5

x2 = 3.5

y2 = 3

m = (y2 - y1) / (x2 - x1)

m = (3 - 3.5) / (3.5 - 1)

m = -0.5 / 2.5

m = -0.2

Hence, the slope of the line that passes through the points (1,3.5) and (3.5,3) is -0.2.

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The time it would take for $20 to grow to $40 at various annual interest rates compounded continuously is calculated using the formula for continuous compound interest.

To find the time it takes for $20 to grow to $40 at a given interest rate compounded continuously, we use the formula for continuous compound interest: A = P * e^(rt),

where

A is the final amount,

P is the initial principal,

e is the base of the natural logarithm,

r is the interest rate, and t is the time.

For the first scenario, with a 2% annual interest rate, we substitute the given values into the formula: $40 = $20 * e^(0.02t). To solve for t, we divide both sides by $20, resulting in 2 = e^(0.02t). Taking the natural logarithm of both sides gives ln(2) = 0.02t. Dividing both sides by 0.02, we find t ≈ ln(2) / 0.02. Evaluating this expression gives the time to the nearest tenth of a year.

To determine the correct answer, we need to calculate the value of t for each of the given interest rates (4%, 8%, and 16%). By applying the same process as described above, we can find the corresponding times to the nearest tenth of a year for each interest rate.

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The 2013 AREC 339 scores were normally distributed with a mean of 80 and a variance of 16. To find P(Y ≤ 70), standardize the score using the formula Z = (X - µ) / σ. The required probabilities are P(Y ≥ 90) = 0.0062b and P(70 ≤ Y ≤ 90) = 0.9938.

Given thatY represents the final scores of AREC 339 in 2013 and it was normally distributed with the mean score of 80 and variance of 16.a. To find P(Y ≤ 70) we need to standardize the score.

Standardized Score (Z) = (X - µ) / σ

Where,X = 70µ = 80σ = √16 = 4Then,Standardized Score (Z) = (70 - 80) / 4 = -2.5

Therefore, P(Y ≤ 70) = P(Z ≤ -2.5)From Z table, we get the value of P(Z ≤ -2.5) = 0.0062b.

To find P(Y ≥ 90) we need to standardize the score. Standardized Score (Z) = (X - µ) / σWhere,X = 90µ = 80σ = √16 = 4Then,Standardized Score (Z) = (90 - 80) / 4 = 2.5

Therefore, P(Y ≥ 90) = P(Z ≥ 2.5)From Z table, we get the value of P(Z ≥ 2.5) = 0.0062c.

To find P(70 ≤ Y ≤ 90) we need to standardize the score. Standardized Score

(Z) = (X - µ) / σ

Where,X = 70µ = 80σ = √16 = 4

Then, Standardized

Score (Z)

= (70 - 80) / 4

= -2.5

Standardized Score

(Z) = (X - µ) / σ

Where,X = 90µ = 80σ = √16 = 4

Then, Standardized Score (Z) = (90 - 80) / 4 = 2.5Therefore, P(70 ≤ Y ≤ 90) = P(-2.5 ≤ Z ≤ 2.5)From Z table, we get the value of P(-2.5 ≤ Z ≤ 2.5) = 0.9938

Hence, the required probabilities are as follows:a. P(Y ≤ 70) = P(Z ≤ -2.5) = 0.0062b. P(Y ≥ 90) = P(Z ≥ 2.5) = 0.0062c. P(70 ≤ Y ≤ 90) = P(-2.5 ≤ Z ≤ 2.5) = 0.9938.

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In summary, ESPN is a multi-sport, direct-to-consumer video service that was launched in April 2018.

It has gained over 2 million subscribers who are exposed to advertisements during the NFL and NBA seasons.

ESPN is a multi-sport, direct-to-consumer video service that was launched in April 2018.

It has over 2 million subscribers who are exposed to advertisements at least once a month during the NFL and NBA seasons.

The launch of ESPN in 2018 marked the introduction of a new platform for sports enthusiasts to access their favorite sports content.

By offering a direct-to-consumer video service, ESPN allows subscribers to stream sports events and related content anytime and anywhere.

With over 2 million subscribers, ESPN has built a significant user base, indicating the popularity of the service.

These subscribers have the opportunity to watch various sports events and shows throughout the year.

During the NFL and NBA seasons, these subscribers are exposed to advertisements at least once a month.

This advertising strategy allows ESPN to generate revenue while providing quality sports content to its subscribers.

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By induction on the degree of R(z), we have R(z)=0,and therefore Q(z)=0. This implies that P1​(z)=P2​(z) for all z

Let us first establish some notations. Since P1​(z) and P2​(z) are polynomials of degree n and m, respectively, and they agree on the interval (−1/2,1/2), we can denote the differences between P1​(z) and P2​(z) by the polynomial Q(z) given by, Q(z)=P1​(z)−P2​(z). It follows that Q(z) has degree at most max(m,n) ≤ m+n.

Thus, we can write Q(z) in the form Q(z)=c0​+c1​z+⋯+c(m+n)z(m+n) for some complex coefficients c0,c1,...,c(m+n).Since P1​(z) and P2​(z) agree on the interval (−1/2,1/2), it follows that Q(z) vanishes at z=±1/2. Therefore, we can write Q(z) in the form Q(z)=(z+1/2)k(z−1/2)ℓR(z), where k and ℓ are non-negative integers and R(z) is some polynomial in z of degree m+n−k−ℓ. Since Q(z) vanishes at z=±1/2, we have, R(±1/2)=0.But R(z) is a polynomial of degree m+n−k−ℓ < m+n. Hence, by induction on the degree of R(z), we have, R(z)=0,and therefore Q(z)=0. This implies that P1​(z)=P2​(z) for all z. Hence, we have proved the desired result.

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To determine the values of x, y, and z, we can solve the equation Ax = ⎝⎛​20−1​⎠⎞​.

Using the given value of A^-1, we can multiply both sides of the equation by A^-1:

A^-1 * A * x = A^-1 * ⎝⎛​20−1​⎠⎞​

The product of A^-1 * A is the identity matrix I, so we have:

I * x = A^-1 * ⎝⎛​20−1​⎠⎞​

Simplifying further, we get:

x = A^-1 * ⎝⎛​20−1​⎠⎞​

Substituting the given value of A^-1, we have:

x = ⎝⎛​3−1−2​010​−101​⎠⎞​ * ⎝⎛​20−1​⎠⎞​

Performing the matrix multiplication:

x = ⎝⎛​(3*-2) + (-1*0) + (-2*-1)​(0*-2) + (1*0) + (0*-1)​(1*-2) + (1*0) + (3*-1)​⎠⎞​ = ⎝⎛​(-6) + 0 + 2​(0) + 0 + 0​(-2) + 0 + (-3)​⎠⎞​ = ⎝⎛​-4​0​-5​⎠⎞​

Therefore, the values of x, y, and z are x = -4, y = 0, and z = -5.

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Our final answer is 1,600 for both by multiplying and factors.

The given problem is asking us to find the product/multiply of 64 and 25.

We are to find it first by breaking down 25 into its terms and second by breaking down 25 into its factors and then multiply 64 by the different parts of the terms.

Let's solve the problem:

Firstly, we'll break down 25 in its terms (20 + 5).

Therefore, we can write:

64 × (20 + 5)

= 64 × 20 + 64 × 5  

= 1,280 + 320

= 1,600.

Secondly, we'll break down 25 in its factors (5 × 5).

Therefore, we can write:

64 × (5 × 5) = 64 × 25 = 1,600.

Finally, we got that 64 × (20 + 5) is equal to 1,600 and 64 × (5 × 5) is equal to 1,600.

Therefore, our final answer is 1,600 for both.

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The formula for the meridian radius of curvature is:

M = a(1 - e²sin²(ϕ))³/²

Where 'a' is the semi-major axis of the ellipse and 'e' is the eccentricity of the ellipse.

To derive the formula for the meridian radius of curvature, we start with the definition of the radius of curvature in calculus and the equation of an ellipse.

The general equation of an ellipse in Cartesian coordinates is given by:

x²/a² + y²/b² = 1

Where 'a' represents the semi-major axis of the ellipse and 'b' represents the semi-minor axis.

Now, let's consider a point P on the ellipse with coordinates (x, y) and a tangent line to the ellipse at that point. The radius of curvature at point P is defined as the reciprocal of the curvature of the curve at that point.

Using the equation of an ellipse, we can write:

x²/a² + y²/b² = 1

Differentiating both sides with respect to x, we get:

(2x/a²) + (2y/b²) * (dy/dx) = 0

Rearranging the equation, we have:

dy/dx = - (x/a²) * (b²/y)

Now, let's consider the trigonometric form of an ellipse, where y = b * sin(ϕ) and x = a * cos(ϕ), where ϕ is the angle made by the radius vector from the origin to point P with the positive x-axis.

Substituting these values into the equation above, we get:

dy/dx = - (a * cos(ϕ) / a²) * (b² / (b * sin(ϕ)))

Simplifying further, we have:

dy/dx = - (cos(ϕ) / a) * (b / sin(ϕ))

Next, we need to find the derivative (dϕ/dx). Using the trigonometric relation, we have:

tan(ϕ) = (dy/dx)

Differentiating both sides with respect to x, we get:

sec²(ϕ) * (dϕ/dx) = (dy/dx)

Substituting the value of (dy/dx) from the previous equation, we have:

sec²(ϕ) * (dϕ/dx) = - (cos(ϕ) / a) * (b / sin(ϕ))

Simplifying further, we get:

(dϕ/dx) = - (cos(ϕ) / (a * sin(ϕ) * sec²(ϕ)))

(dϕ/dx) = - (cos(ϕ) / (a * sin(ϕ) / cos²(ϕ)))

(dϕ/dx) = - (cos³(ϕ) / (a * sin(ϕ)))

Now, we can find the derivative of (1 - e²sin²(ϕ))³/² with respect to x. Let's call it D.

D = d/dx(1 - e²sin²(ϕ))³/²

Applying the chain rule and the derivative we found for (dϕ/dx), we get:

D = (3/2) * (1 - e²sin²(ϕ))¹/² * d(1 - e²sin²(ϕ))/dϕ * dϕ/dx

Simplifying further, we have:

D = (3/2) * (1 - e²sin²(ϕ))¹/² * (-2e²sin(ϕ)cos(ϕ) / (a * sin(ϕ)))

D = - (3e²cos(ϕ) / (a(1 - e²sin²(ϕ))¹/²))

Now, substit

uting this value of D into the derivative (dy/dx), we get:

dy/dx = (1 - e²sin²(ϕ))³/² * D

Substituting the value of D, we have:

dy/dx = - (3e²cos(ϕ) / (a(1 - e²sin²(ϕ))¹/²))

This is the derivative of the equation of the ellipse with respect to x, which represents the meridian radius of curvature, denoted as M.

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The researcher's distribution of paper questionnaires to individuals in impoverished neighborhoods is an example of a cross-sectional survey used to gather data about meal purchasing and preparation strategies.

The researcher distributing paper questionnaires to individuals in the thirty most impoverished neighborhoods in America asking about their

strategies to purchase and make meals is an example of a survey-based research method.

This method is called a cross-sectional survey. It involves collecting data from a specific population at a specific point in time.

The purpose of this survey is to gather information about the strategies individuals in impoverished neighborhoods use to purchase and prepare meals.

By distributing paper questionnaires, the researcher can collect responses from a diverse group of individuals and analyze their answers to gain insights into the challenges they face and the strategies they employ.

It is important to note that surveys can provide valuable information but have limitations.

For instance, the accuracy of responses depends on the honesty and willingness of participants to disclose personal information.

Additionally, the researcher should carefully design the questionnaire to ensure it captures the necessary data accurately and effectively.

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The student performed better on the second test as the z-score for the second test is higher than the z-score for the first test.

To determine on which exam the student performed better, we need to use the z-score formula:z = (x - μ) / σwhere x is the score, μ is the mean, and σ is the standard deviation.For the first test, given that the mean and standard deviation were 475 and 100 respectively and the student scored 625, we can find the z-score as follows:

z1 = (625 - 475) / 100 = 1.5

For the second test, given that the mean and standard deviation were 30 and 8 respectively and the student scored 43, we can find the z-score as follows:z2 = (43 - 30) / 8 = 1.625Since the z-score for the second test is higher, it means that the student performed better on the second test

The z-score is a value that represents the number of standard deviations from the mean of a normal distribution.  A z-score of zero indicates that the score is at the mean, while a z-score of 1 indicates that the score is one standard deviation above the mean. Similarly, a z-score of -1 indicates that the score is one standard deviation below the mean.In this problem, we are given the mean and standard deviation for two national aptitude tests taken by a student. The scores of the student on these tests are also given.

We need to use the z-scores to determine on which exam the student performed better.To calculate the z-score, we use the formula:z = (x - μ) / σwhere x is the score, μ is the mean, and σ is the standard deviation. Using this formula, we can find the z-score for the first test as:z1 = (625 - 475) / 100 = 1.5Similarly, we can find the z-score for the second test as:z2 = (43 - 30) / 8 = 1.625Since the z-score for the second test is higher, it means that the student performed better on the second test. This is because a higher z-score indicates that the score is farther from the mean, which in turn means that the score is better than the average score.

Thus, we can conclude that the student performed better on the second test as the z-score for the second test is higher than the z-score for the first test.

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The data is not being read file and entered into the pretty table because there is a name error, `imFormat`, `imType`, `imWidth`, and `imHeight` are not declared in all cases before their usage. Here is the modified version of the script with corrections:```
# Python Standard Library
import os
from prettytable import PrettyTable
from PIL import Image

myTable = PrettyTable(["Path", "File Size", "Ext", "Format", "Width", "Height", "Type"])
dirPath = input("Provide Directory to Scan:")
if os.path.isdir(dirPath):
   fileList = os.listdir(dirPath)
   for eachFile in fileList:
       try:
           localPath = os.path.join(dirPath, eachFile)
           absPath = os.path.abspath(localPath)
           ext = os.path.splitext(absPath)[1]
           filesizeValue = os.path.getsize(absPath)
           fileSize = '{:,}'.format(filesizeValue)
       except:
           continue

       # 3rd Party Modules from PIL
       imageFile = input("Image to Process: ")
       try:
           with Image.open(absPath) as im:
               # If successful, get the details
               imStatus = 'YES'
               imFormat = im.format
               imType = im.mode
               imWidth = im.size[0]
               imHeight = im.size[1]
       except Exception as err:
           print("Exception: ", str(err))
           continue
       myTable.add_row([localPath, fileSize, ext, imFormat, imWidth, imHeight, imType])

   print(myTable)
```The above script now reads all the images in a directory and outputs details like format, width, and height in a pretty table.

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Longitudinal correlation is a statistical tool used to analyze time and sequence in behavior, development, and health. It assesses the degree of association between variables over time, determining if changes are related or if one variable predicts another. Linear statistics calculate linear relationships, while correlation coefficients measure association. Curvilinear associations study curved relationships.

To examine time and sequence, longitudinal correlations are needed. Longitudinal correlation is a method that assesses the degree of association between two or more variables over time or over a defined period of time. It is used to determine whether changes in one variable are related to changes in another variable or whether one variable can be used to predict changes in another variable over time.

It is an essential statistical tool for studying the dynamic changes of behavior, development, health, and other phenomena that occur over time. A longitudinal study design is used to assess the stability, change, and predictability of phenomena over time. When analyzing longitudinal data, linear statistics, correlation coefficients, and curvilinear associations are commonly used.Linear statistics is a statistical method used to model linear relationships between variables.

It is a method that calculates the relationship between two variables and predicts the value of one variable based on the value of the other variable.

Correlation coefficients measure the degree of association between two or more variables, and it is used to determine whether the variables are related. It ranges from -1 to +1, where -1 indicates a perfect negative correlation, +1 indicates a perfect positive correlation, and 0 indicates no correlation.

Curvilinear associations are used to determine if the relationship between two variables is curvilinear. It is a relationship that is not linear, but rather curved, and it is often represented by a parabola. It is used to study the relationship between two variables when the relationship is not linear.

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Given that f is a one-to-one function and f(4) = -7. We need to find f⁻¹(-7). The definition of one-to-one function f is a one-to-one function, it means that each input has a unique output. In other words, there is a one-to-one correspondence between the domain and range of the function. It also means that for each output of the function, there is one and only one input. Let us denote f⁻¹ as the inverse of f and x as f⁻¹(y). Now we can represent the given function as: f(x) = -7Let y = f(x) and x = f⁻¹(y) Now substituting f⁻¹(y) in place of x, we get: f(f⁻¹(y)) = -7Since f(f⁻¹(y)) = y We get: y = -7Therefore, f⁻¹(-7) = 4 Hence, f⁻¹(-7) = 4.

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The system of equations -2x + y = -3 in both choices has a solution of (-4, 5).

The two choices that have a solution of (-4, 5) when written as a system are:

1. A 2-column table with 4 rows. Column 1 is labeled x with entries -1, 2, 3, 5. Column 2 is labeled y with entries 2, -1, -2, -4.

  -2x + y = -3

2. A 2-column table with 4 rows. Column 1 is labeled x with entries -1, 2, 3, 7. Column 2 is labeled y with entries 0, -3, -4, -8.

  -2x + y = -3

In both cases, when we substitute x = -4 and y = 5 into the equations, we get:

-2(-4) + 5 = -3

8 + 5 = -3

-3 = -3

Therefore, the system of equations -2x + y = -3 in both choices has a solution of (-4, 5).

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The value of the functions are;

f(g(x)) = 1/6x

g(f(x)) = x-7/6 + 7

From the information given, we have that the functions are expressed as;

f(x)  = 1/ x-7

g(x) =(6/x) + 7.

To determine the composite functions, we need to substitute the value of f(x) as x in g(x) and also

Substitute the value of g(x) as x in the function f(x), we have;

f(g(x)) = 1/(6/x) + 7 - 7

collect the like terms, we get;

f(g(x)) = 1/6x

Then, we have that;

g(f(x)) = 6/ 1/ x-7 + 7

Take the inverse, we have;

g(f(x)) = x-7/6 + 7

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The dollar price of china is $1,450 at the given exchange rate.

A US firm purchases some English China. The China costs 1,000 British pounds. The exchange rate is $1.45 = 1 pound. To find the dollar price of the china, we need to convert 1,000 British pounds to US dollars. Using the given exchange rate, we can convert 1,000 British pounds to US dollars as follows: 1,000 British pounds x $1.45/1 pound= $1,450. Therefore, the dollar price of china is $1,450.

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The domain and range of the function in this problem are given as follows:

The domain and the range of the parent square root function are given as follows:

The function in this problem was translated one unit left and two units up, hence the domain and the range are given as follows:

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We have proven that γ ^i _[jk] is a (1,2) tensor.

To prove that A _ij;k is symmetric in the indices i and j, given that A _ij is symmetric, we can use the symmetry of A _ij and the properties of partial derivatives.

Let's consider A _ij, which is a symmetric matrix, meaning A _ij = A _ji.

Now, let's compute the derivative A _ij;k with respect to the index k. Using the definition of partial derivatives, we have:

A _ij;k = ∂(A _ij)/∂x^k

Using the symmetry of A _ij (A _ij = A _ji), we can rewrite this as:

A _ij;k = ∂(A _ji)/∂x^k

Now, let's swap the indices i and j in the partial derivative:

A _ij;k = ∂(A _ij)/∂x^k

This shows that A _ij;k is symmetric in the indices i and j. Therefore, if A _ij is a symmetric matrix, its derivative A _ij;k is also symmetric in the indices i and j.

Regarding the object γ ^i _jk, which is an affine connection that is not symmetric in j and k, we can show that γ ^i _[jk] is a (1,2) tensor.

To prove this, we need to show that γ ^i _[jk] satisfies the transformation properties of a (1,2) tensor under coordinate transformations.

Let's consider a coordinate transformation x^i' = f^i(x^j), where f^i represents the transformation function.

Under this coordinate transformation, the affine connection γ ^i _jk transforms as follows:

γ ^i' _j'k' = (∂x^i'/∂x^i)(∂x^j/∂x^j')(∂x^k/∂x^k')γ ^i _jk

Using the chain rule, we can rewrite this as:

γ ^i' _j'k' = (∂x^i'/∂x^i)(∂x^j/∂x^j')(∂x^k/∂x^k')γ ^i _jk

Now, let's consider the antisymmetrization of indices j and k, denoted by [jk]:

γ ^i' _[j'k'] = (∂x^i'/∂x^i)(∂x^j/∂x^j')(∂x^k/∂x^k')γ ^i _[jk]

Since γ ^i _jk is not symmetric in j and k, it means that γ ^i' _[j'k'] is also not symmetric in j' and k'.

This shows that γ ^i _[jk] is a (1,2) tensor because it satisfies the transformation properties of a (1,2) tensor under coordinate transformations.

Therefore, we have proven that γ ^i _[jk] is a (1,2) tensor.

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This means that the expected value of y cubed is 1, while the expected value of y to the fourth power is 0.

[tex]E[y^3] = 1\\\E[y^4] = 0[/tex]

The moment generating function (MGF) of a standard normal random variable y is given by [tex]M(t) = e^{\frac{t^2}{2}}[/tex]. To find [tex]E[y^3][/tex], we can differentiate the MGF three times and evaluate it at t = 0. Similarly, to find [tex]E[y^4][/tex], we differentiate the MGF four times and evaluate it at t = 0.

Step-by-step calculation for[tex]E[y^3][/tex]:
1. Find the third derivative of the MGF: [tex]M'''(t) = (t^2 + 1)e^{\frac{t^2}{2}}[/tex]
2. Evaluate the third derivative at t = 0: [tex]M'''(0) = (0^2 + 1)e^{(0^2/2)} = 1[/tex]
3. E[y^3] is the third moment about the mean, so it equals M'''(0):

[tex]E[y^3] = M'''(0)\\E[y^3] = 1[/tex]

Step-by-step calculation for [tex]E[y^4][/tex]:
1. Find the fourth derivative of the MGF: [tex]M''''(t) = (t^3 + 3t)e^(t^2/2)[/tex]
2. Evaluate the fourth derivative at t = 0:

[tex]M''''(0) = (0^3 + 3(0))e^{\frac{0^2}{2}} \\[/tex]

[tex]M''''(0) =0[/tex]
3. E[y^4] is the fourth moment about the mean, so it equals M''''(0):

[tex]E[y^4] = M''''(0) \\E[y^4] = 0.[/tex]

In summary:
[tex]E[y^3][/tex] = 1
[tex]E[y^4][/tex] = 0

This means that the expected value of y cubed is 1, while the expected value of y to the fourth power is 0.

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The proportion of sweet cherries weighing less than 5 ounces is approximately 0.2389, rounded to four decimal places. Answer: 0.2389.

We know that the weight of sweet cherries is normally distributed with mean μ=6 ounces and standard deviation σ=1.4 ounces.

Let X be the random variable representing the weight of sweet cherries.

Then, we need to find P(X < 5), which represents the proportion of sweet cherries weighing less than 5 ounces.

To solve this problem, we can standardize the distribution of X using the standard normal distribution with mean 0 and standard deviation 1. We can do this by calculating the z-score as follows:

z = (X - μ) / σ

Substituting the given values, we get:

z = (5 - 6) / 1.4 = -0.7143

Using a standard normal distribution table or calculator, we can find the probability that Z is less than -0.7143, which is equivalent to P(X < 5). This probability can also be interpreted as the area under the standard normal distribution curve to the left of -0.7143.

Using a standard normal distribution table or calculator, we find that the probability of Z being less than -0.7143 is approximately 0.2389.

Therefore, the proportion of sweet cherries weighing less than 5 ounces is approximately 0.2389, rounded to four decimal places. Answer: 0.2389.

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The area of a rectangular swimming pool is given by the product of its length and width, while the volume of the pool is the product of the area and its depth.

He area of the pool is given as [tex]4x² + 3x - 10[/tex], while the depth is given as 2x - 3. To find the volume of the pool, we need to multiply the area by the depth. The expression for the area of the pool is: Area[tex]= 4x² + 3x - 10[/tex]Since the length and width of the pool are not given.

We can represent them as follows: Length × Width = 4x² + 3x - 10To find the length and width of the pool, we can factorize the expression for the area: Area

[tex]= 4x² + 3x - 10= (4x - 5)(x + 2)[/tex]

Hence, the length and width of the pool are 4x - 5 and x + 2, respectively.

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To achieve a future value of $3000.00 after 13 weeks at a simple interest rate of 15.0%, you need to invest approximately $1,016.95 as the present value. This calculation is based on the formula for simple interest and rounding to the nearest cent.

The present value P that you must invest to have a future value A of $3000.00 at a simple interest rate of 15.0% after a time period of 13 weeks is $2,696.85.

To calculate the present value, we can use the formula: P = A / (1 + rt).

Given:

A = $3000.00 (future value)

r = 15.0% (interest rate)

t = 13 weeks

Convert the interest rate to a decimal: r = 15.0% / 100 = 0.15

Calculate the present value:

P = $3000.00 / (1 + 0.15 * 13)

P = $3000.00 / (1 + 1.95)

P ≈ $3000.00 / 2.95

P ≈ $1,016.94915254

Rounding to the nearest cent:

P ≈ $1,016.95

Therefore, the present value you must invest to have a future value of $3000.00 at a simple interest rate of 15.0% after 13 weeks is approximately $1,016.95.

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If four numbers are selected from the first ten natural numbers. The probability that only two of them are even is [tex]\frac{10}{21}[/tex].

The probability of an event is a number that indicates how likely the event is to occur.

[tex]Probability =\frac{favourable \ outcomes}{total \ number \ of \ outcomes}[/tex]

If four numbers are selected out of first 10 natural numbers, the probability that two of the numbers are even implies that other two number are odd. Out of 5 odd natural number (1,3,5,7,9) two are selected and similarly out of the 5 even natural number(2,4,6,8,10) , two are selected.

[tex]Probability =\frac{favourable \ outcomes}{total \ number \ of \ outcomes}[/tex]

P = [tex]\frac{^5C_2 \ ^5C_2}{^{10}C_4} = \frac{10}{21}[/tex]

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The complete question is given below,

If four numbers are selected from the first ten natural numbers. What is the probability that only two of them are even?

(i) The 95% confidence interval for the population mean is approximately 6.14 to 6.86 years, and we are 95% confident that the true population mean falls within this range.

(ii) With a 99% confidence level, the confidence interval would be wider, but no further calculations are required to determine the specific interval width.

(iii) To estimate the mean number of years in school within 0.5 year with 98% confidence, a sample size of at least 58 men would be needed.

(i) To construct a 95% confidence interval for the population mean:

Calculate the standard error (SE) using the sample standard deviation and sample size.

Determine the critical value (Z) corresponding to a 95% confidence level.

Calculate the margin of error (ME) by multiplying the standard error by the critical value.

Construct the confidence interval by adding and subtracting the margin of error from the sample mean.

(ii) If the confidence level is increased to 99%, the critical value (Z) would be larger, resulting in a wider confidence interval. No further calculations are required to determine the interval width.

(iii) To estimate the mean number of years in school within 0.5 year with 98% confidence:

Determine the desired margin of error.

Determine the critical value (Z) for a 98% confidence level.

Use the formula for sample size calculation, where the sample size equals (Z² * sample standard deviation²) divided by (margin of error²).

Therefore, constructing a 95% confidence interval provides a range within which we are 95% confident the true population mean lies. Increasing the confidence level to 99% widens the interval. To estimate the mean with a specific margin of error and confidence level, the required sample size can be determined using the formula.

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The total cost to use the phone per month, including the purchase price, is P^(33),500.00 per month. This is because the monthly plan cost of P^(3),500.00 is added to the purchase price of P^(30),000.00.

To break it down further, the total cost for one year would be P^(69),000.00, which includes the initial purchase price of P^(30),000.00 and 12 months of the P^(3),500.00 monthly plan. Over two years, the total cost would be P^(102),000.00, and over three years, it would be P^(135),000.00.

It's important to consider the total cost of a phone before making a purchase, as the initial price may be just a small part of the overall cost. Monthly plans and other fees can add up quickly, making a seemingly affordable phone much more expensive in the long run.

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