The critical value of z separates the rejection region from the nonrejection region while observed value of z is the value calculated for a sample statistic such as x.
A critical value of z is used when the sampling distribution is normal, or close to normal. The critical value of z refers to the point that cuts off area under graph for the standard normal distribution separating the rejection and nonrejection region of the data. The Critical value of z can indicate what probability any particular variable will have. These values are typically obtained from a table such as the standard normal distribution table. The observed value of z is a value determined for a sample statistic x. It is a test statistic for Z-tests that measures the difference between an observed statistic and its hypothesized population parameter in units of the standard deviation.
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a store sold a case of scented candles for $ 17.85 that had been marked up 110 % what was the original price
The original Price of a case of scented candles was 8.5
What is percentage increase?A percent increase refers to how much a percentage has gone up over time.
In order to reach this number, you would need to find the difference between the original value and the final value, subtracting to find the exact total of the decrease.
The formula for calculating Percentage increase is:
(ΔPrice/Original price) × 100
change in price (new price - original price)/original price) × 100
From the question:
Percentage increase = 110%
New price = 17.85
Original price = X
so it we can substitute in the formula
((17.85 - X)/X) * 100 = 110%
Opening brackets
(17.85*100 - X*100)/ X =110
1785 - 100X = 110X (we balance the equation)
(we collect like terms)
1785 = 210X
to find X we divide both sides by 210
1785/210 = X
8.5
The original Price was $8.5
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Software companies work hard to produce software without bugs. A particular company claims that 85% of the software it produces is bug free. A random sample of size 200 showed 156 softwareprograms were bug free.
a. Calculate the mean of the sampling distribution of the sample proportion.
the sample proportion under probability has a mean sampling distribution of 82.
The population percentage is the major variable in the sampling distribution of this proportion, which has a quarter-um normal distribution. Variants include population proportion times one and population proportion divided by sample size. Additionally, we are aware that the population proportion is under the null hypothesis. 200 is the sample soil. When we enter the value of P into this calculation without normalisation, we can obtain the standing ovation as the variance's root. 025 in excess. The probability that we got a sample result of 188/58 or less is then calculated. We simply need to determine this left tail probability after that.
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Determine whether the pairs of functions in Problems 20 through 26 are linearly independent or linearly dependent on the real line. 20. f(x) = g(x) = cos? x + sinx 21. f(x)=x,8() = x+|x| 23. f(x) = xe", g(x) = |x|e" 22. f(x) = 1 + x, 8(x) = 1 + x 24. f(x) = sinx, g(x) = 1 - cos 2x 25. f(x) = e sinx, g(x) = e* cos x 26. f(x) = 2 cos x + 3 sinx, g(x) = 3 cos x - 2 sin x
The pairs of function which are linearly independent are f(x) = 2cos x + 3 sin x and g(x) = 3cox x - 2 sin x.
We need to determine the pairs of functions are linearly independent or linearly dependent on the real line
f(x) = 2cos x + 3 sin x
g(x) = 3cox x - 2 sin x
Let c₁f(x) and c₂g(x) = 0
using wornkskin method
w(f, y) = [tex]\left[\begin{array}{cc}f(x)&g(x)\\f'(x)&g'(x)\\\end{array}\right] \\\left[\begin{array}{cc}2cosx + 3sin x&3cos x - 2 sin x\\-2sin x + 3 cos x&-3sin x - 2 cos x\\\end{array}\right][/tex]
= - (2cos x + 3sin x) (3 sinx + 2 cos x) - (3cos x - 2sin x) (3cos x - 2sin x)
= - (9sin²x + 4cos² x + 12cos x sin x) + 9cos² x + 4 sin² x - 12 sin x cos x
= - (13 sin² x + 13 cos² x )
= - 13
since,
w(f , g) ≠ 0
f, g are linearly independent
Therefore, the function f(x) = 2cos x + 3 sin x and g(x) = 3cox x - 2 sin x are linearly independent.
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a pair of fair dice is cast. what is the probabiliy that at least one of the numbers falling uppermost is a 1, given that the sum of the numbers falling uppermost is even? a) 0.4545 b) 0.3056 c) 0.3667 d) 0.2778 e) 0.1389 f) none of the above.
The probability that at least one of them is a 1 is 0.2778 when a fair set of dice is thrown and the total of the numbers falling above them is even.
Given that,
A fair set of dice is thrown.
We have to find given that the total of the numbers falling above them is even, what is the probability that at least one of them is a 1.
We know that,
A fair set of dice is thrown.
The total of the numbers falling above them is even.
The probability that at least one of them is a 1 is
(5/36)/(8/36)
5/18
0.2778
Therefore, The probability that at least one of them is a 1 is 0.2778 when a fair set of dice is thrown and the total of the numbers falling above them is even.
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(- 9x³-7x²-3x - 1) − (6x³ + 5x² + 2x + 2)
Find the difference
Answer:
(-15x^3 -12x^2 -5x-3)
Step-by-step explanation:
You can't add/subtract numbers that have different exponent numbers so you have to stick with the ones that have the same number
So then the coefficients would be:
x^3 : -9 - 6 = -15
x^2 : -7 -5 = -12
x: -3 -2 =-5
0: -1 - 2 = -3
Tammy has $20 to spend at the movie theater. She spends $9.50 on a movie ticket. If the snack counter sells bags of candy for $3.50 each, how many bags of candy can Tammy buy with the money she has left?
Answer:3
Step-by-step explanation:
20-9.50=11-3.50
A hobby store prices model train track using a proportional relationship between the length of track (in inches) and the cost in dollars. If 6. 4 inches of track costs $16, what is the constant of proportionality?.
$2.50 is found to be the proportionality constant for the relationship between the length of track (in inches) and the cost in dollars.
Define the term constant of proportionality?The ratio connecting two given numbers in what is regarded as a proportional relationship is the constant of proportionality. Constant ratio, consistency index, unitary rate, constant variable variation, and even rate of change are other names for said constant of proportionality.Direct proportionality is represented by the equation y = kx.
Where:
dependent variable = yx = unrelated variableK is the proportionality constant.The price of the track is the dependent variable in this situation.
The tracks' length is an independent variable.
$16 = 6.4k
k = 16 / 6.4
k = $2.5
Thus, the constant of proportionality for the relationship between the length of track (in inches) and the cost in dollars is found as $2.5.
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Find the area of the figure. 16 cm 9 cm
suppose there are n independent trials of an experiment with k>3 mutually exclusive outcomes, where p i represents the probability of observing the ith outcome. what would be the formula of an expected count in this situation?
The probability for observing the expected count will be given by [tex]E_i = nP_i[/tex]
Consider an experiment with n independent trials and k > 3 mutually incompatible outcomes.
Where [tex]P_i[/tex] stands for the likelihood of seeing the i-th result.
Hence for the nth expected result on i will be given by multiplying the i-th probability with the expected variable n.
Hence [tex]E_i = n\times P_i[/tex]
∴ [tex]E_i = nP_i[/tex] provides the predicted numbers for each potential outcome.
where pi is the likelihood of seeing the i-th result.
The predicted count of the i-th result is called [tex]E_i[/tex].
When two events cannot occur concurrently at the same moment, they are said to be mutually exclusive in accordance with probability theory. Or, to put it another way, discontinuous events are said to be mutually exclusive.
There is no possibility of two occurrences occurring simultaneously if they are viewed as separate events. If two events do not take place at the same time, they are said to be mutually exclusive. If a coin is tossed, the outcome will always be either head or tail; we cannot get both.
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=
Find the quadratic function y = a(x-h)2 whose graph passes through the given points.
(12,-10) and (8,0)
Answer:
y = -5/8(x -8)²
Step-by-step explanation:
You want the function of the form y = a(x -h)² that passes through the points (12, -10) and (8, 0).
Vertex formThe vertex form of the equation of a quadratic is ...
y = a(x -h)² +k . . . . . . quadratic with vertex (h, k)
Comparing this to the given equation, we see that k=0. This means the point (8, 0) is the vertex and h = 8.
Scale factorThe value of 'a' can be found using the other point.
(x, y) = (12, -10)
-10 = a(12 -8)²
-10 = 16a
-5/8 = a . . . . . . divide by 16 and reduce the fraction
The quadratic function is y = -5/8(x -8)².
__
Additional comment
The equation can also be found using technology to do a quadratic regression with the constraint that the vertex is on the x-axis.
Divide and state the quotient in simplest form.
[tex]\cfrac{x^2-4x-45}{x+6}\div\cfrac{x^2-3x-40}{x+6}\implies \cfrac{x^2-4x-45}{~~\begin{matrix} x+6 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~ }\cdot \cfrac{~~\begin{matrix} x+6 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~ }{x^2-3x-40} \\\\\\ \cfrac{x^2-4x-45}{x^2-3x-40}\implies \cfrac{(x-9)~~\begin{matrix} (x+5) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}{(x-8)~~\begin{matrix} (x+5) \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}\implies \cfrac{x-9}{x-8}[/tex]
A tollbooth collected $900 on a day
in which a total of 1,100 cars and
trucks passed through. Cars pay a
$0.75 toll, and trucks pay a $1.25
toll. How many cars paid the toll
that day?
Using system of linear equations, the number of cars and trucks that parked are 950 and 150 respectively.
System of linear equationThe system of linear equations is the set of two or more linear equations involving the same variables. Here, linear equations can be defined as the equations of the first order, i.e., the highest power of the variable is 1. Linear equations can have one variable, two variables, or three variables. Thus, we can write linear equations with n number of variables.
To solve this problem, we have to write out two equations and solve the unknown variable.
x = carsy = trucksx + y = 1100 ...eq(i)
0.75x + 1.25y = 900 ...eq(ii)
From equ(i)
x = 1100 - y ..eq(iii)
Put eq(iii) into eq(ii)
0.75(1100 - y) + 1.25y = 900
y = 150
Put y = 150 in equation (i)
x + 150 = 1100
x = 1100 - 150
x = 950
x = 950, y = 150
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Suppose it takes 4 hours for a certain strain of bacteria to reproduce by dividing in half. If 45 bacteria are present o begin with the total number present after a days is f(x) = 45 - 64* Find the total number present after 1, 2 and 3 days. There will be bacteria present after 1 day, after 2 days and after 3 days.
A certain bacteria strain needs 4 hours to double its population. If in the beginning there are 45 bacteria, after 1 day, the number of bacteria present is 2,880, after 2 days, the number of bacteria is 184,320, after 3 days, the number of bacteria is 11,796,480.
The problem can be solved using the exponential growth model.
In the given problem, the formula for the growth model is given, that is:
f(x) = 45 (64)^(x)
Where:
f(x) = total number of bacteria present after x days
To find f(x) for 1 day, 2 days, and 3 says, substitute x = 1, x = 2, and x = 3 into the formula.
f(1) = 45 (64)¹ = 2,880
f(2) = 45 (64)² = 184,320
f(3) = 45 (64)³ = 11,796,480
Hence,
after 1 day, the number of bacteria present is 2,880, after 2 days, the number of bacteria is 184,320, after 3 days, the number of bacteria is 11,796,480.
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if a string of length thirteen over {a, b, c, d} is chosen at random, what is the probability that it contains at least one pair of adjacent characters that are the same? (round your answer to the nearest tenth of a percent.)
The total number of possible strings that can be chosen is 4^13, since there are 13 characters and 4 possible choices for each character, b, c, d). Now, we need to determine the number of strings that contain at least one pair of adjacent characters that are the same in this probability.
To do this, we'll consider each letter in the string and calculate the number of possible strings that contain at least one pair of adjacent characters that are the same for that letter. For the first letter in the string, there are 4 strings that contain at least one pair of adjacent characters that are the same (aa, bb, cc, dd).For the second letter in the string, there are 4 strings that contain at least one pair of adjacent characters that are the same (ab, be, cd, dc).For the third letter in the string, there are 4 strings that contain at least one pair of adjacent characters that are the same (ac, bd, ca, db.).For the fourth letter in the string, there are 4 strings that contain at least one pair of adjacent characters that are the same (ad, bc, da, cb).
We can continue this process for each letter
We get probability as 83.3%
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7. towers a lookout tower sits on a network of struts and posts. leslie measured two angles on the tower. if m∠1=7x-7°, m∠2=4x 2°, and m∠3=2x 6°, what is m∠1?
The measure of the ∠1 for the given angles of the triangle are found as 1162/13.
Explain the angle sum property of the triangle?The internal angle of a triangle is just the angle formed by two of its sides. It is often referred to as the triangle's interior angle property. Because of this characteristic, a triangle's interior angles add up to 180 degrees.The given angles are-
∠1 = 7x - 7.
∠2 = 4x + 2
∠3 = 2x + 6
By the angle sum property of the triangle.
∠1 + ∠2 + ∠3 = 180
Thus,
7x - 7 + 4x + 2 + 2x + 6 = 180
Simplifying,
13x = 179
x = 179/13
So, ∠1 becomes-
∠1 = 7x - 7
∠1 = 7(179/13)- 7
∠1 = 1162/13
Thus, the measure of the ∠1 for the given angles of the triangle are found as 1162/13.
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What’s higher -12 or -24
let g be a group of order 840, and suppose k is a subgroup of g of order 42. if h is a subgroup of g that contains k as a subgroup, what could the order of h be? explain
The order of H can be 84 , 210 or 420
One of the key theorems in abstract algebra is the Lagrange theorem. According to the Lagrange Theorem , In group theory, for any finite group say G, the order of subgroup H of group G is the divisor of the order of G. The order of the group represents the number of elements
According to the question,
Group G has order 840
Also , By Lagrange's theorem
|K| divides |H| , so order of h should be multiple of 42
|H| = 42k ------(1) (for some k)
And , H is subgroup of G
|G| should divides |H|
=> 42k should divides 840
=> k = 840/42 = 20
Since , H is proper subgroup of G
K < 20
So, either k =2 , 5 or 10
Hence , order of H can be 84 , 210 or 421
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Oliver and his little brother made up a game using coins. They flip the coins toward a cup and receive points for everyone that makes it in. Oliver starts with 16 points, and his little brother starts with 27 points. Oliver gets 2 points for every successful shot, and his brother, since he is younger, gets 1 point for each successful shot. Eventually, the brothers will have a tied score in the game. How many additional shots will each brother have made? How many points will they both have?
Oliver and his little brother will have an additional shot of 11shots and they both have 38points
What are Simultaneous equations?Simultaneous equations are two or more algebraic equations that share variables e.g. x and y . They are called simultaneous equations because the equations are solved at the same time. For example, below are some simultaneous equations: 2x + 4y = 14 and 4x − 4y = 4.
Represent the number of additional shot made by the brothers as x and the common point made by both of them be y
therefore,
16+2x=y equation 1
27+x= y equation 2
subtract equation 1 from 2
11-x= 0
therefore x= 11
substitute 11 for x in equation 2
y = 27+ 11
y= 38
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the following data on price ($) and the overall score for 6 stereo headphones that were tested by consumer reports were as follows. brand price ($) score bose 180 72 scullcandy 150 78 koss 96 66 phillips/o'neill 72 54 denon 72 42 jvc 48 24 a. does the t test indicate a significant relationship between price and the overall score?
There is significant relation between price and overall score.
Given that,
Following are details on the cost ($) and final rating for the six stereo headphones that Consumer Reports examined. ($) brand price Score: Bose 180, 72 Scullcandy 150, 78 Koss, 96, 54 Phillips/O'Neill, 72, 42 Denon, 48, 24.
a) t =3.54
The P value is less than 0.2
There is significant relation between price and overall score.
P value is between 0.01 and 0.025.
Because p value is less than or equal to 0.05 , we reject H₀ : β₁ is equal to zero.
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REALLY EASY!! BRAINIEST FOR THE FASTEST AND THE CORRECT ANSWER! NO NEED TO EXPLAIN! I WILL REPORT IF WRONG OR IF YOU COPIED AN ANSWER
Answer: 26%
Step-by-step explanation:
23 + 52 + 34 + 61 + 30 = 200
do 52/200 because theres 52 gumballs and times it by 100
52/200 x 100 = 26% on calculator
Lexi is rehydrating after an intense workout. She drinks 1/4 of a gallon every 50 minutes, or 5/6 of an hour. How many gallons of water does she drink in one hour?
Lexi drinks 3/10 gallon of water in one hour.
What is ratio?Ratio basically compares quantities, that means it show value of one quantity with respect to other quantity.
If a and b are two values, their ratio will be a:b,
Given that,
Lexi drinks water in 50 minutes = 1/4 gallon
To find water that Lexi drinks in one hour,
Use ratio property,
50 minutes = 1/4 gallon
1 minute = 1/(4 x 50)
60 minutes = 60/(4 x 50)
60 minutes = 3/10 gallon
Lexi drinks 3/10 gallon of water in 1 hour.
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Find an expression which represents the difference when (2x − 6) is subtracted
from (7-5) in simplest terms.
Answer:
-2x + 8
Step-by-step explanation:
(2x - 6) is subtracted from (7 - 5).
First term that into an equation.
Because our first term is being subtracted from our second one, our equation is written as:
(7 - 5) - (2x - 6).
Simplify the first term by subtracting:
7 - 5 = 2
Now simplify the second term by multiplying 2x - 6 by -1 to get them out of the parenthesis. We do this because there is a negative sign in front of it.
-1 (2x - 6)
-2x + 6
Now our equation is:
2 - 2x + 6
Combine like terms:
2 + 6 = 8
So -2x + 8
(2x - 6) subtracted from (7 - 5) is -2x+8
Find the length of the third. If necessary, round to the nearest tenth 18 12
Answer:
Since it appears that you are talking about a triangle, if the third side that you are looking for is the hypotenuse, then you can use the Pythagorean theorem, a^2 + b^2 = c^2. In this case, the length of the side, if it would be the hypotenuse, would be approximately 21.63.
Step-by-step explanation:
Hope this helped! :D
which of the following expressions are equivalent to…
Answer: none of the above
Explanation: as it's - -8/-4 it means the answer is negative which none of the answers provided are so it's none of the above
What is the unit rate for 9 pages in 3 hours? Which answer is correct?
(1): 1 page/3 hours
(2): 3 pages/1 hour
(3): 6 pages/1 hour
(4): 9 pages/3 hours
Answer:
(2) 3 pages in 1 hour
Step-by-step explanation: Simply dividing 9/3 we get, 3/1 by unitary method this is the right answer.
g 2. the following series can be written with a shorthand form of sigma notation (a). use for loop syntax to calculate this arithmetic series: ; n
Using for loop we can get the syntax in order to calculate this arithmetic series n is A = 0.9999.
An arithmetic collection is the sum of the phrases in an mathematics collection with a specific range of phrases. Following is a easy system for locating the sum: Formula 1: If S n represents the sum of an mathematics collection with phrases.
This system calls for the values of the primary and ultimate phrases and the range of phrases. Finite Sequence- Finite sequences have countable phrases and do now no longer cross as much as infinity. An instance of a finite mathematics collection is 2, 4, 6, 8. Infinite Sequence- Infinite arithmetic collection is the collection wherein phrases cross as much as infinity.
using while
A=0; n=1; while n<=10000 A=A+(1/(n*(n+1))); n=n+1; end A
output
A = 0.9999
using for loop
A=0; for n=1:10000 A=A+(1/(n*(n+1))); end A
output
A = 0.9999.
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Correct Question:
The following series can be written with a shorthand form of sigma notation (A). Use while syntax to calculate this arithmetic series:
1/(1x2) + 1/(2x3) + 1/(3x4) + ... + 1/(n x (n+1)) ......1
A = ∈ 1/(n x (n+1)); n=[1:10000]
I’m wondering why my teacher marked me wrong on these two problems. Was there something in my work that was wrong?
(Just check 1 and 2)
On #1, you used the side of 18 twice.
You should have had
[tex]\dfrac{40.5}{18}=\dfrac{49.5}{22}=\dfrac{54}{\boldsymbol{24}}[/tex]
with 24 in that last denominator. And with 24 in the last denominator, they're all equal to 2.25.
On #2, you should have compared 90 to 40 and then 81 to 36:
[tex]\dfrac{90}{40}=\dfrac{81}{36}[/tex]
Those are both equivalent to 9/4.
f(x) = −2|x + 4|; h(x) = f(-x) describe the transformation
The vertex of the function is transformed from (-4,0) to (4,0). The expression will be transformed from f(x) = −2|x + 4| to h(-x) = -2|-x + 4|.
What is an expression?The mathematical expression combines numerical variables and operations denoted by addition, subtraction, multiplication, and division signs.
Mathematical symbols can be used to represent numbers (constants), variables, operations, functions, brackets, punctuation, and grouping. They can also denote the logical syntax's operation order and other properties.
Given that the absolute function is f(x) = −2|x + 4|. The transformed function is calculated as,
f(x) = −2|x + 4|
h(-x) = −2|-x + 4|
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jaime is preparing for a bicycle race. his goal is to bicycle an average of at least 280280280 miles per week for 444 weeks. he bicycled 240240240 miles the first week, 310310310 miles the second week, and 320320320 miles the third week. which inequality can be used to represent the number of miles, xxx, jaime could bicycle on the 4^\text{th}4 th 4, start superscript, start text, t, h, end text, end superscript week to meet his goal?
The inequality that can be used to represent the number of miles, x, Jaime could bicycle on the 4th week to meet his goal is 240 + 310 + 320 + x ≥ 4 (280).
What is inequality?
In mathematics, "inequality" refers to a relationship between two expressions or values that are not equal to each other.
For the next four weeks, Jaime wants to log at least 280 miles per week on average. Jamie's objective can be graphically expressed by the inequality: T4, or alternatively T 4 if T is the total number of miles he will pedal his bicycle for four weeks (280).
The sum of the distances Jamie has covered and has yet to cover is the total number of miles Jamie will cycle during this time. Hence, T = 240 + 310 + 320 + x. Replacing this term into the inequality T ≥ 4(280) gives 240 + 310 + 320 + x ≥ 4(280). Therefore, choice D is the correct answer.
Thus, the correct answer is 240 + 310 + 320 + x ≥ 4 (280).
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Find the Sum.
1/6+2/3=?
Answer:
5/6
Step-by-step explanation:
1. Line up the fractions
1/6
+ 2/3
_____
2. Find the common denominator
1/6 x 1/1
+ 2/3 x 2/2
_____
Thus, we get:
1/6
+ 4/6
_____
3. Add
1/6
+ 4/6
_____
5/6
May I have Brainliest please? My next rank will be the highest one: A GENIUS! Please help me on this journey to become top of the ranks! I only need 5 more brainliest to become a genius! I would really appreciate it, and it would make my day! Thank you so much, and have a wonderful rest of your day!
Answer:
5/6 which is also 0.833
Step-by-step explanation:
(The whiteboard below)