A researcher wishes to see if there is a difference in the cholesterol levels of two groups of men. A random sample of 30 men between the ages of 25 and 40 is selected and tested, the average cholesterol level was 223 with standard deviation of 6.1. A second sample of 25 men between ages of 41 and 56 is selected and tested, the average cholesterol level for this group was 229 with standard deviation of 5.8. Assume the populations are normally distributed and the population standard deviation are unequal.

A. At [tex]\alpha = 0.01[/tex], is there a difference in the cholesterol levels between the two groups? Use traditional method.

B. Use confidence interval to verify your answers in (A).

Answers

Answer 1

a. There is a difference in the cholesterol levels between the two groups.

b. The confidence interval for the differences is of (1.7, 10.3), not containing 0 and thus verifying what was found in item a.

What are the hypothesis tested?

At the null hypothesis, it is tested that there is no difference, that is, the mean of the subtraction is of zero, hence:

[tex]H_0: \mu_d = 0[/tex]

At the alternative hypothesis, it is tested if there is a difference, that is, the mean of the subtraction is different of zero, hence:

[tex]H_1: \mu_d \neq 0[/tex]

We have a two-tailed test, as we are testing if the mean is different of value, with 30 + 25 - 2 = 53 df, with a significance level of 0.01, hence the critical value is of:

t = 2.6718

Hence the decision rule, considering the test statistic t, is given as follows:

|t| < 2.6718: do not reject the null hypothesis -> not enough evidence to conclude that there is a difference.|t| > 2.6718: reject the null hypothesis -> enough evidence to conclude that there is a difference.

What are the mean and the standard deviation of the distribution of differences?

For each sample, the mean and the standard error are given as follows:

Sample 1: [tex]\mu_1 = 223, s_1 = \frac{6.1}{\sqrt{30}} = 1.1137[/tex].Sample 2: [tex]\mu_2 = 229, s_2 = \frac{5.8}{\sqrt{25}} = 1.16[/tex].

Hence the mean and the standard error for the distribution of differences is given as follows:

Mean: [tex]\overline{x} = \mu_2 - \mu_1 = 229 - 223 = 6[/tex].Standard Error: [tex]s = \sqrt{s_1^2 + s_2^2} = \sqrt{1.1137^2 + 1.16^2} = 1.61[/tex]

What is the test statistic?

The test statistic is obtained as the division of the sample mean by the standard error, hence:

t = 6/1.61

t = 3.73.

t > 2.6718, hence the null hypothesis is rejected, and there is a difference in the cholesterol levels between the two groups.

What is the confidence interval?

The confidence interval is obtained as the sample mean plus/minus the multiplication of the standard error and of the critical value.

Hence the lower bound of the confidence interval is of:

6 - 2.6718 x 1.61 = 1.7.

The upper bound is of:

6 + 2.6718 x 1.61 = 10.3.

More can be learned about the test of an hypothesis at https://brainly.com/question/13873630

#SPJ1


Related Questions

2 + 10 ^2 ( 9 + 10 )

Answers

Answer:

The answer is 1902

Step-by-step explanation: You use pemdas. First you ansewer whats in the parentheses then exponents then add

Answer:

1902

Step-by-step explanation:

10^2= 100

9+10= 19

2+100(19) 19*100=1900 and then add 2 to get 1902

find the most general antiderivative of the function. (check your answer by differentiation. use c for the constant of the antiderivative. remember to use absolute values where appropriate.) f(x)

Answers

Answer:

Step-by-step explanation:

in the stock market, changes in value used to be indicated by fractions, which represented portions of $1. if a stock had a value of $11.50, write and evaluate an addition expression to find how much the stock is worth after an increase of 1/4

Answers

The worth of the stock after the increase is $14.375.

What is an expression?

Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations.

Based on the information given, the addition expression will be:

= Original value + Increase

= $11.50 + (1/4 × $11.50)

= $11.50 + $2.875

= $14.375

The value is $14.375.

Learn more about expressions on:

brainly.com/question/723406

#SPJ1

4. ¿Por qué al colocar un vaso lleno sobre un papel y tirar con fuerza de éste, el vaso no se mueve?

Answers

Answer: The glass of water has inertia

Step-by-step explanation: The trick works no matter how heavy an object is since friction is weaker for lighter objects. Provided you pull quickly enough, this trick can even be done with glasses or plate

using a random sample from a population, carys cannot decide if she wants to construct a 90 percent confidence interval for the population mean or a 95 percent confidence interval for the population mean. what is the difference between the two confidence intervals?

Answers

if a statistician decides to construct using 90 percent C I over a 95% C I, it tells you that you have 10% chance of being wrong rather than 5% chance of being wrong while using the 95%.

What is the percentage?

It's the ratio of two integers stated as a fraction of a hundred parts. It is a metric for comparing two sets of data, and it is expressed as a percentage using the percent symbol.

A confidence interval is a range that shows how precise the measurement is.

if a statistician decides to construct using 90 percent C I over a 95% C I, it tells you that you have 10% chance of being wrong rather than 5% chance of being wrong while using the 95%.

Also a 90 percent confidence interval would be narrower than a 95 percent confidence interval

To Learn more about the percentage form the link:

brainly.com/question/8011401

#SPJ4

x^2 + 4x + y^2 - 4y - 28= 0

Answers

I don't know for certain if you are trying to write this in standard form, graph it, or so forth. However, here is the standard form.

Standard Form:

[tex](x+2)^2+(y-2)^2=36\\[/tex]

Hope this helps you!

A truck has a mass of 5000 kg. The truck driver presses on the brakes. The unbalanced net force acting on the truck when the brakes were applied was 6000N. What is the truck’s Acceleration?

Answers

The acceleration of the truck when it has a mass of 5000 kg and the truck driver presses on the brakes is 1.2m/s².

What is acceleration?

The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations.

The orientation of an object's acceleration is determined by the orientation of the net force acting on that object's acceleration, which is the rate at which velocity changes over time in terms of both speed and direction. A point or object moving in a straight line is accelerated if it accelerates or decelerates.

Acceleration will be:

= Force / mass

= 6000 / 5000

= 1.2 m/s²

Learn more about acceleration on:

https://brainly.com/question/460763

#SPJ1

Find the indicated side.

Answers

Hence, the indicated side hypotenuse is [tex]46[/tex].

What is the angle?

Angles are an integral facet in the study of mathematics, particularly geometry. Angles are formed by two rays (or lines) that begin at the same point or share the same endpoint. The point at which the two rays meet (intersect) is called the vertex.

Let us assume the angle name [tex]x[/tex] and  the triangle [tex]ABC[/tex], and the hypotenuse is [tex]y[/tex].

Here given angle and side are

[tex]x=30[/tex] degree

And the side [tex]AB=23[/tex]

Now we are applying the [tex]sine[/tex] because it is

[tex]sinx=\frac{P}{H}[/tex]

So,

[tex]sin(30)=\frac{23}{y}\\\\\frac{1}{2}=\frac{23}{y}\\\\y=46[/tex]

Hence, the indicated side hypotenuse is [tex]46[/tex].

To know more about the angles

https://brainly.com/question/15277238

#SPJ1

a single die is rolled twice. find the probability of getting a 3 the first time and a 3 the second time.

Answers

The probability of rolling a 3 the first time and a 3 the second time is 1/36.

Given that,

There are two rolls of one die.

We have to determine the probability of receiving a 3 both the first and second times.

We know that,

There are 6 faces on a die.

Of these 6 faces, one of them is 3 and one of them is 3

So, the probabilities of rolling a 3 and a 3 are:

P(3) = 1/6

P(3) = 1/6

The probability of rolling a 3 the first time and a 3 the second time is calculated as follows:

Pr=P(3)×P(3)

This gives

Pr=1/6×1/6

Multiply

Pr=1/36

Therefore, the probability of rolling a 3 the first time and a 3 the second time is 1/36.

To learn more about probability visit: https://brainly.com/question/11234923

#SPJ4

Simplify the following by applying the laws of exponents.

Answers

Expression [tex]\frac{x^7y^5}{x^2y^3}[/tex] can be simplified as x⁵y² by applying laws of components.

What is an algebraic expression?

An algebraic expression is consists of variables, numbers with various mathematical operations,

The given expression is,

[tex]\frac{x^7y^5}{x^2y^3}[/tex]

Simplify the expression by using law of exponents [tex]a^n/a^m =a^{(n-m)[/tex],

The expression can be rewritten as,

= [tex]x^{(7-2)}{y^{(5-3)}[/tex]

= x⁵ y²

The expression can be simplified as x⁵y².

To know more about Algebraic expression on:

https://brainly.com/question/19245500

#SPJ1

Circle the numbers that are divisible by both 2 and 3 (20,36,42,45,50,78)

Answers

Answer: 36, 42, 78

Step-by-step explanation:

20 is only divisible by 2
50 is only divisible by 2
45 is only divisible by 3
36/2=18 36/3=12
42/2=21 42/3=14
78/2=39 78/3=26

Answer: 36, 42, 78

Step-by-step explanation:

36/2= 15, 36/3=12

42/2= 21, 42/3=14

78/2=39, 78/3=39

solve please i'm desperate

Answers

Answer:

-4/5 (fraction)

Step-by-step explanation:

add the numbers:

25x^2-16=0

use quadratic formula

simplify -40/50

-4/5

when the null hypothesis is rejected, it is possible a type ii error has occurred. not possible a type i error has occurred. possible a type i error has occurred. possible either a type i or a type ii error has occurred.

Answers

When the null hypothesis is rejected possible a Type i error has occurred.

Let's Understand what is null hypothesis?

A statistical hypothesis known as a null hypothesis asserts that no statistical significance can be found in a set of provided observations. Using sample data, hypothesis testing is used to judge a hypothesis' veracity. It is sometimes referred to as just "the null" and its symbol is [tex]H_{0}[/tex].

We have total 4 cases:

[tex]H_{0}[/tex]  accepted when  [tex]H_{0}[/tex] is true ->  Correct decision

[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is true -> Type i Error  when null hypothesis is  present and we have rejected

[tex]H_{0}[/tex] accepted when [tex]H_{0}[/tex] is false -> Type ii Error when null hypothesis is not  present but we have accepted

[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is false -> Correct decision.

So according to question null hypothesis is rejected so we have two options Either Null hypothesis is present or not present.

if it is present  then it is Type i Error.

if it is not present then it is Correct decision.

So when the null hypothesis is rejected possible a Type i error has occurred.

To know more about null hypothesis here.

https://brainly.com/question/2707344

#SPJ4

What is the value of the expression below when z = 3?
z²+z+7

Answers

Answer:

19

Step-by-step explanation:

3^2+3+7

9+3+7

12+7

19

Hopes this helps please mark brainliest

the correct answer to this is 19. this is because z+z+7

Please help me!
If f(x) = 3x^2 -3 then what is f(4)?
Show work

Answers

Answer:

f(4)= 45

Step-by-step explanation:

f(x)=3x^2-3. (1)

f(4)=?

so we have to put x=4 in equation (1)

we get

f(4)=3[(4)^2]-3

f(4) =3(16)-3

f(4)= 48-3

f(4)= 45 Answer...

convert 436 mm to cm. answer as a whole number or decimal number with the correct number of significant figures.

Answers

Answer: 43.6cm

Hope it helps

If $a$, $b$, $c$, and $d$ are four different digits from $1$ to $9$, inclusive, then what's the largest possible value for the decimal $a. B + c. D$ ?.

Answers

The largest possible value for the decimal $a. B + c. D$  us:

9.7 + 8.6 which results to 18.3.

Given that a, b, c, and d are different numbers (from 1 to 9), we are to find the largest possible value of a.b + c.d.

This problem can be answered by trial and error and with some logic. Clearly, a to d cannot be at the lower end of the values (1 to 5). Since the digits must be different, it can be a combination of digits from 6 to 9.

It is rather tempting to say that the 9.8 + 7.6 would yield the highest possible sum (=17.4) but this is incorrect. Since it is the sum of two numbers with a decimal, we have to maximize on the ones digit first before maximizing the tenths digit. Therefore: the combination of numbers must then be:

9.7 + 8.6 which results to 18.3

9.6 + 8.7 yields 18.3 as well.

Hence we get the required answer,

Learn more about Decimals here:

brainly.com/question/28416295

#SPJ4

place the flags 1 standard deviation on either side of the mean. what is the area between these two values? what does the empirical rule say this area is?

Answers

The area between one standard deviation and either side of mean is 34%

The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all observed data will fall within three standard deviations (denoted by σ) of the mean or average (denoted by µ).

In particular, the empirical rule predicts that 68% of observations falls within the first standard deviation (µ ± σ)

95% within the first two standard deviations (µ ± 2σ)

99.7% within the first three standard deviations (µ ± 3σ).

According to the question,

If we place the flag 1 standard deviation on either side of the mean

which means flag is placed either on (µ + σ) or ( (µ - σ)

and Using Empirical rule,

68% of area lie under (µ ± σ)

Therefore , Area between either  (µ + σ) or ( (µ - σ) = 68 / 2

=> 34%

To know more about empirical rule here

https://brainly.com/question/27605836

#SPJ4

the trade magazine qsr routinely checks the​ drive-through service times of​ fast-food restaurants. ​% confidence interval that results from examining customers in taco​ bell's drive-through has a lower bound of seconds and an upper bound of seconds. complete parts​ (a) through​ (c). question content area bottom part 1 ​(a) what is the mean service time from the ​customers? the mean service time from the customers is enter your response here seconds

Answers

The mean service time from the ​customers are between 161.5 to 164.7 seconds.

The trade magazine QSR routinely checks the​ drive-through service times of​ fast-food restaurants.

A 90% confidence interval that results from examining 607 customers in Taco Bell's drive-through has a lower bound of 161.5 seconds and an upper bound of 164.7 seconds.

Let's denote the mean service time by μ. Then, note that, we are given that n=607. Also, we are said that a 90% CI for μ is given by

(161.5,164.7)

This implies that we are 90% confident that μ lies in the interval. Or to be precise, this interval is a realization of a random interval that has 90% probability of covering the true mean. Thus, we are 90% confident that the mean service times of the restaurants are between 161.5 to 164.7 seconds.

Hence the answer is The mean service time from the ​customers are between 161.5 to 164.7 seconds.

To learn more about mean click here https://brainly.com/question/1136789

#SPJ4

(1 point) some shrubs have the useful ability to resprout from their roots after their tops are destroyed. fire is a particular threat to shrubs in dry climates, as it can injure the roots as well as destroy the aboveground material. one study of resprouting took place in a dry area of mexico. the investigation clipped the tops of samples of several species of shrubs. in some cases, they also applied a propane torch to the stumps to simulate a fire. of 14 specimens of a particular species, 6 resprouted after fire. estimate with 95% confidence the proportion of all shrubs of this species that will resprout after fire.

Answers

With a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.

What is a confidence interval?

An area surrounding a measurement that indicates how accurate it is called a confidence interval.

Here, we have

Confidence interval is written as

Sample proportion ± margin of error

Margin of error = z × √pq/n

Where

z represents the z score corresponding to the confidence level

p = sample proportion. It also means the probability of success

q = probability of failure

q = 1 - p

p = x/n

Where

n represents the number of samples

x represents the number of success

From the information given,

n = 14

x = 6

p = 6/14 = 0.42

q = 1 - 0.42 = 0.58

To determine the z score, we subtract the confidence level from 100% to get α

α = 1 - 0.95 = 0.05

α/2 = 0.05/2 = 0.025

This is the area in each tail.

Since we want the area in the middle, it becomes

1 - 0.025 = 0.975

The z score corresponding to the area on the z table is 2.05. Thus, Thus, the z score for a confidence level of 95% is 1.96

Therefore, the 95% confidence interval is

0.42 ± 1.96√(0.58)(0.42)/14

The lower limit of the confidence interval is

0.42 - 0.25 = 0.17

The upper limit of the confidence interval is

0.42 + 0.25 = 0.67

Hence, with a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.

To learn more about the confidence interval from the given link

https://brainly.com/question/20309162

#SPJ4

Given 29 213.
Which lines, if any, must be parallel based on the given
information? Justify your conclusion.
c|d, Converse of the Same-Side Interior Angles
Theorem
a | b, Converse of the Alternate Interior Angles
Theorem
c|| d. Converse of the Corresponding Angles
Theorem
not enough information to make a conclusion

Answers

Answer:

has to be c other wise it would make sense

3. AABC AEFG, mZA = 25°, and m/F = 100°.
What is m/C?
A. 125°
B. 100°
C. 55°
D. 25°

Answers

Answer: A

Step-by-step explanation: To solve this problem, we need to use the properties of triangles and the given information to determine the measure of angle C.

First, we can use the fact that angle A is opposite angle C to deduce that angles A and C are congruent (i.e. they have the same measure). This means that the measure of angle C is 25 degrees.

Next, we can use the fact that triangle AABC is isosceles (i.e. it has two sides of equal length) to deduce that angle B is also 25 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle A is 25 degrees and angle C is 25 degrees, then the remaining angle, angle B, must be 180 - (25 + 25) = 130 degrees.

We can also use the fact that triangle AEFG is isosceles to deduce that angle F is also 100 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle E is 100 degrees, then the remaining angle, angle F, must be 180 - 100 = 80 degrees.

Finally, we can use the given information that the measure of angle Z is 25 degrees and the measure of angle F is 100 degrees to deduce that the measure of angle X is 180 - (25 + 100) = 55 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, and we have already determined the measures of two of the angles (angles Z and F).

Therefore, the measure of angle C is 25 degrees, which means the correct answer is A) 125 degrees.

it is A because of sum stuff

Sugar Bombs cereal is including a Sherlock Holmes action-figure in each box during a
promotion. Claire plans to purchase boxes until she has all five action-figures. How many boxes
should she expect to buy if each figure is equally likely to be in any box??
a. Describe how you will use a random number table to conduct this simulation.
b. Show five trials by clearly labeling the random number table given below. Specify the outcome of each trial.
73184 95907 05179 51002 83374 52297 07769 99792 78365 93487
72753 36216 07230 35793 71907 65571 66784 25548 91861 15725
c. State your conclusion.

Answers

Part a: Ignoring those that are bigger than 4.

Part b: labeling the random number.

Part c: conclusion, Claire should plan to purchase 12 boxes.

Describe the term random number table?A table of digits is a random number table. The numbers 1, 2, 3,4,5,6,7,8,9,0 were used as the starting point for the random procedure that selected the digit for each location in the table. Each digit had an equal chance of being selected.

Part a: random number table;

Let each of five trials figures be represented by a number from 0 to 4.Pick digits at random from a table of numbers, ignoring those that are bigger than 4. Determine how many digits (0–4) from the table—including repeats—are required to get all five numbers. One try, like this.

Part b: labeling the random number.

7318495907 05179 51002(10 boxes) 8337452297 07769 99792 78365 9348772753 36216 (15 boxes) 07230 35793 71907 65571 66784(10 boxes) 25548 91861 15725.

Part c: conclusion,

On average, Claire should plan to purchase 12 boxes.

To know more about the random number table, here

https://brainly.com/question/11809277

#SPJ4

Find the values of the variables in each parallelogram

Answers

Adjacent angles of a parallelogram are supplementary.

[tex]y+3y=180 \\ \\ 4y=180 \\ \\ y=\boxed{45} \\ \\ \\ \\ 3(45)+3x=180 \\ \\ 45+x=60 \\ \\ x=\boxed{15}[/tex]

Hi pls help me
Answer also the 3 questions

Answers

Step-by-step explanation:

the table was filled correctly already by somebody yesterday.

the important thing to remember is that an arc angle is always measured at the center point of the circle. that is the difference to angles between the intersecting lines of arc segments.

it would be really important that you start doing these things yourself. this hands-on experience of these (really basic) questions is designed to help you get a feeling how these things work together, which makes later topics much easier for you.

please tell me what you don't understand here. you only need to apply common sense. no magic voodoo math formulas or strategies.

FAR = 100° FR = 140° VO = 60° FR+VO = 200°

FAV = 80° FV = 60° RO = 100° FV+RO = 160°

OAV = 100° VO = 60° FR = 140° VO+FR = 200°

OAR = 80° RO = 100° FV = 60° RO+FV = 160°

how did we get the measures of the intercepted arcs ? by counting the 20° segments on the arc. the full circle arc represents 360°. always, for every circle. one time around is one time around and therefore 360°, no matter the size of the circle.

when you stand directly on the south pole of the Earth for 24 hours, you will have rotated the full 360° in that time (one rotation per day). if you stand on the equator for 24 hours, the Earth has taken you on one spin of the full 360°. the difference is the absolute arc length and the necessary speed at which we cover the distance of a full arc length.

every 250 million years our whole sogar system rotates once (by the full 360°) around the center of our galaxy.

the degrees have nothing to do with radius, diameter, area, ... of a circle. only with the relative parts of the circumference. when the minute arm of a clock moved for 15 minutes, then it went 90° around the clock's face. after 60 minutes it went the full 360°, and the cycle starts anew.

so, minutes on a clock or hours of the day are just another way of counting degrees around a circle.

what have we noticed with the sum of the measures of the intercepted arcs ?

many things.

e.g.

they are exactly twice as large as the line angles. 100 to 200. 80 to 160.

the sum of 2 pairs of opposing arc angles is always 360°.

...

so, how will we get the line angles based on the sum of the angles of the intersected arcs ?

we cut the sum of the intersected arc angles in half. 200 to 100. 160 to 80.

-Snow skis were first used in northern Europe and Asia thousands of
from the bones of large animals
years ago. They were probably (18)
and strapped with strips of leather to the boots of skiers. These primitive
skis were used primarily on flat ground as a means of traveling from one
(19) for rapid
place to another. The loose bindings made them too
downhill movement. Not until the development of better skis, more secure
(20) as a
19
fastening methods, and ski lifts did skiing attain
recreational and competitive sport.
18 F diverted
G dissected
H fashioned
J manufactured
A annoying
B laborious
C precarious
D inaccurate
20 F projection
G productivity
H perspective
J prominence

Answers

Answer:

no

Step-by-step explanation:

suppose you live on the moon. how long is a day (i.e., from sunrise to sunrise)? a) 23 hours 56 minutes b) 24 hours c) a lunar month d) a year e) about 18 years

Answers

If we live on the moon, a day on the Moon is about a lunar month long

The correct answer is an option (c)

We know that a day is the length of time between two noons or sunsets. A day is of 24 hours on Earth and 708.7 hours (which is 29.53 Earth days) on the moon.

We know that a lunar month is nothing but the time the Moon takes to go around the Earth.

A lunar month is of approximately 29.53 days.

This means, a day on the Moon is about a lunar month.

Therefore, a day on the Moon is of 708.7 hours i.e., about a lunar month.

Learn more about the lunar month here:

https://brainly.com/question/29441668

#SPJ4

A student wants to compare textbook prices for two online bookstores. She takes a random sample of five textbook titles from a list provided by her college bookstore, and then she determines the prices of those textbooks at each of the two websites. The prices of the five textbooks selected are listed below in the same order for each online bookstore. com: $115, $43, $99, $80, $119 com: $110, $40, $99, $69, $109 Are these independent or dependent samples? Dependent. Different textbooks are being compared. Dependent. The same textbooks are being compared. Independent. Different textbooks are being compared. Independent. The same textbooks are being compared. To construct a confidence interval, the data must be checked for outliers. (Is it reasonable to assume that the data came from a normal population?) Which variable should be checked? the prices of textbooks from B.com the difference between the average textbook price for A.com and the average textbook price for B.com the difference between the textbook price from A.com and the textbook price from B.com for each textbook, the prices of textbooks from A.com Find a 96% confidence interval for the mean difference in textbook prices at the two online bookstores. (Use d = A.com - B.com.) (Use 3 decimal places)

Answers

A 96% confidence interval for the mean difference in textbook prices at the two online bookstores is (3.22,8.38).

What is a confidence interval?

An estimated range for an unknown parameter is known as a confidence interval. The 95% confidence level is the most popular, however other levels, such as 90% or 99%, are occasionally used when computing confidence intervals.

Here, we have

The mean and standard deviation are M = 5.8 and s = 4.658

To calculate the estimated standard error, we apply

S = [tex]\sqrt{s^2/n}[/tex]

 =[tex]\sqrt{4.658^2/5}[/tex]

= 2.08

The 96% confidence interval is :

CI = x ±t₉₆s/√n

= 5.8 ±2.7764× 2.08/√5

= 5.8±2.58

= (3.22,8.38)

Hence, a 96% confidence interval for the mean difference in textbook prices at the two online bookstores is (3.22,8.38).

To learn more about the confidence interval from the given link

https://brainly.com/question/20309162

#SPJ4

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of exactly eight boys in ten births.

Answers

There is a 0.044% probability of having exactly 8 boys in a sample of 10 births.

What is probability?

Simply put, the probability is the likelihood that something will occur.

When we don't know how an event will turn out, we can discuss the likelihood or likelihood of several outcomes.

Statistics is the study of events that follow a probability distribution.

For instance, there is only one way to receive a head and there are a total of two possible outcomes, hence the probability of flipping a coin and getting heads is 1 in 2 (a head or tail).

P(heads) = 1/2 is what we write.

So, X is the proportion of boys among n particular births. Let p represent the likelihood of having a boy at a certain birth.

Here n=10.

Additionally, because male and female births are equally likely, there is a 50% chance of having a boy or a girl.

P(Boy) = P(girl) = 0.5

p = 0.5

Based on the information provided, there will be a defined number of trials (n) of 10, with a constant chance of success (p).

Furthermore, every trial stands alone from the others.

So, with n=10 and p=0.5, X follows a binomial distribution.

The following is the probability function of the binomial distribution for the k number of successes, where x = k.

[tex]\mathrm{P}(\mathrm{X}=\mathrm{k})=(10 C k) 0.5^k(1-0.5)^{10-k}[/tex]

Finding the likelihood of 8 boys in n=10 births is necessary.

P(X=8) = (10C8)0.5⁸(1-0.5)¹⁰⁻⁸

= 45 × 0.0039 × 0.25

P(X = 8) = 0.0438

Therefore, there is a 0.044% probability of having exactly 8 boys in a sample of 10 births.

Know more about probability here:

https://brainly.com/question/28924396

#SPJ4

v.2 find the slope from two points

Answers

Answer:y2-y1/x2-x1

Step-by-step explanation:

The formula for rise over run or slope is y2-y1 divided by x2-x1

An example

(5,4),(3,7)

y2=7,y1=4

x2=3,x1=5

plug in and solve

7-4/3-5

slope would be -1

Other Questions
Why is there such a high earthquake hazard along the borders of arkansas, tennessee, kentucky, missouri, and illinois?. Find the midpoint of the line segment from (1,-3) to(-5,2) caroline has prepared for her informative speech by making a brief set of speaker's notes with keywords and phrases. she avoided writing out her speech word- for- word so that she can sound more conversational and maintain eye contact with the audience. caroline is demonstrating which method of speech delivery? as you approach an airport to land, you observe a convective cloud over the airport with virga below it. this could indicate under check 21, the maximum time that a bank can hold funds from deposited checks before making them available to the depositor will increase. if a retrovirus could infect one of any of these kinds of cells, which would amplify it the most within the first 2 hours? Which balanced redox reaction is occurring in the voltaic cell represented by the notation of a l ( s ) | a l 3 + ( a q ) | | p b 2 + ( a q ) | p b ( s ) ?. compare and contrast roman and greek civilization. How do you find themes in a play? figure out what lessons the characters learn and how they learned itidentify the sensory languageidentify the setting of the playidentify what kind of play you are reading Graph 50 pointsMarking brainliest Out of 168 randomly selected adults in the United States who were surveyed, 89 exercise on a regular basis. Construct a 98 % confidence interval for the proportion of all adults in the United States who exercise on a regular basis. Round to three decimal places. a planet with a radius of 6.00 x 107 m has a gravitational field of magnitude 30.0 m/s? at the surface. what is the escape speed from the planet? what is the formal charge on the central atom in a molecule of o3? hint: it may be helpful to draw the lewis structure for this molecule the european central bank uses main refinancing operations as the predominant form of open market operations, which are similar to the fed's repo transactions.True or False Q4.The 5th term of an arithmetic series is 4k, where k is a constant.The sum of the first 8 terms of this series is 20k + 16(a) (i) Find, in terms of k, an expression for the common difference of the series.(ii) Show that the first term of the series is 16 - 8kGiven that the 9th term of the series is 24, find(b) the value of k,(c) the sum of the first 20 terms. according to social psychologist fritz heider, when we incorrectly believe that a person's behavior is due to their disposition, rather than underlying context, we have committed a . Which of the following is the approximate internal rate of return for an investment that costs $45,880 and has net cash flows of $4,000 for 20 years?Reason: 45,880/4000=11.47. Look at Table B.3 in the 20 year row for the present value factor closest to 11.47. You'll see 6% three disaccharides are important in the human diet: sucrose, lactose, and maltose. click and drag the monosaccharides to build each of the disaccharides below. an older male patinet complains to his nurse that his immediate family doesnt take his health care seiously. which tool might be most heplful in determing the functionality of this family Find the value of c guaranteed by the Mean Value Theorem for Integrals for the function 2x+1 on the interval [3,6].