Question 1

To perform a hypothesis test of two population proportions, the pooled estimate of p must be determined. The pooled estimate,   , is

Accepted Answer

A)    =   
B)    =   +   
C)    =   
D)    =   
A)    =   
B)    =   +   
C)    =   
D)    =

Question 2

Perform the appropriate hypothesis test.
-A random sample of   individuals results in   successes. An independent sample of   individuals results in   successes. Does this represent sufficient evidence to conclude that   at the α = 0.01 level of significance?

Accepted Answer

The answer of Perform the appropriate hypothesis test.
-A random sample...

Question 3

Test the hypothesis that   =   . Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05.

Accepted Answer

test statistic ≈ 6.17; P-value

Question 4

Data sets A and B are dependent. Find   .   Assume that the paired data came from a population that is normally distributed.

Accepted Answer

A)  -5.1 
B)  25.2 
C)  33.1 
D)  9.0 
A)  -5.1 
B)  25.2 
C)  33.1 
D)  9.0

Question 5

Test the hypothesis that   <   . Use α = 0.10. The sample statistics listed below are from independent samples.Sample statistics:   = 550,   = 121, and   = 690,   = 195

Accepted Answer

test statistic @#IMG-DLM& ≈ -2.51; P-val

Question 6

Find the test statistic to test the hypothesis that   =   . Two samples are randomly selected from each population. The sample statistics are given below. Use ? = 0.05.

Accepted Answer

A)  8.1 
B)  3.8 
C)  4.2 
D)  6.2 
A)  8.1 
B)  3.8 
C)  4.2 
D)  6.2

Question 7

Find the test statistic, z, to test the hypothesis that   <   . Use ? = 0.10. The sample statistics listed below are from independent samples.Sample statistics:   = 550,   = 121, and   = 690,   = 195

Accepted Answer

A)  -2.513 
B)  -2.132 
C)  1.116 
D)  -0.985 
A)  -2.513 
B)  -2.132 
C)  1.116 
D)  -0.985

Question 8

A well-known study of 22,000 male physicians was conducted to determine if taking aspirin daily reduces the chances of a heart attack. Half of the physicians were given a regular dose of aspirin while the other half was given placebos. Six years later, among those who took aspirin, 104 suffered heart attacks while among those who took placebos, 189 suffered heart attacks. Does it appear that the aspirin can reduce the number of heart attacks among the sample group that took aspirin? Use α = 0.01.

Accepted Answer

hypothesis: @#IMG-DLM& < @#IMG-DLM& ; test statist

Question 9

We are interested in comparing the average supermarket prices of two leading colas in the Tampa area. Our sample was taken by randomly going to each of eight supermarkets and recording the price of a six-pack of cola of each brand. The data are shown in the following table. Find a 98% confidence interval for the difference in mean price of brand 1 and brand 2. Assume that the paired data came from a population that is normally distributed.

Accepted Answer

A)  (-0.0722, -0.0028) 
B)  (-0.1768, 0.1018) 
C)  (-0.0846, 0.0096) 
D)  (-0.0779, 0.0029) 
A)  (-0.0722, -0.0028) 
B)  (-0.1768, 0.1018) 
C)  (-0.0846, 0.0096) 
D)  (-0.0779, 0.0029)

Question 10

Construct a 95% confidence interval for data sets A and B. Data sets A and B are dependent.   Assume that the paired data came from a population that is normally distributed.

Accepted Answer

A)  (-0.696, 18.700) 
B)  (-15.341, 15.431) 
C)  (-0.113, 12.761) 
D)  (-1.324, 8.981) 
A)  (-0.696, 18.700) 
B)  (-15.341, 15.431) 
C)  (-0.113, 12.761) 
D)  (-1.324, 8.981)

Question 11

Find the test statistic, t, to test the hypothesis that   ?   . Two samples are randomly selected and come from populations that are normal. The sample statistics are given below.

Accepted Answer

A)  -1.821 
B)  -2.123 
C)  -1.326 
D)  -1.546 
A)  -1.821 
B)  -2.123 
C)  -1.326 
D)  -1.546

Question 12

Data sets A and B are dependent. Test the claim that   = 0. Use α = 0.05.   Assume that the paired data came from a population that is normally distributed.

Accepted Answer

test statistic t ≈ 2.580; 0.05

Question 13

Test the hypothesis that   <   . Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05.

Accepted Answer

test statistic ≈ -3.90; P-valu

Question 14

What is the   for testing differences of the means of two independent samples?

Accepted Answer

A) : ? B) : > C) : < D) : - =0 A) : ? B) : > C) : < D) : - =0

Question 15

Perform the appropriate hypothesis test.
-The table below shows the weights, in pounds, of seven subjects before and after following a particular diet program for three months. Does the sample evidence suggest that the diet program is effective in reducing weight? Use the   level of significance. Assume that the differenced data come from a population that is normally distributed with no outliers.

Accepted Answer

The answer of Perform the appropriate hypothesis test.
-The table below...

Question 16

A football coach claims that players can increase their strength by taking a certain supplement. To test the theory, the coach randomly selects 9 athletes and gives them a strength test using a bench press. The results are listed below. Thirty days later, after regular training using the supplement, they are tested again. The new results are listed below. Test the claim that the supplement is effective in increasing the athletes' strength. Use α = 0.05. Assume that the distribution is normally distributed.

Accepted Answer

claim: @#IMG-DLM& < 0; test statistic t

Question 17

Find the test statistic, z, to test the hypothesis that   =   . Use ? = 0.05. The sample statistics listed below are from independent samples.Sample statistics:   = 50,   = 35, and   = 60,   = 40

Accepted Answer

A)  2.361 
B)  1.328 
C)  0.374 
D)  0.982 
A)  2.361 
B)  1.328 
C)  0.374 
D)  0.982

Question 18

A new weight-reducing technique, consisting of a liquid protein diet, is currently undergoing tests before its introduction into the market. A typical test performed is the following: The weights of a random sample of five people are recorded before they are introduced to the liquid protein diet. The five individuals are then instructed to follow the liquid protein diet for 3 weeks. At the end of this period, their weights (in pounds) are again recorded. The results are listed in the table. Let   be the true mean weight of individuals before starting the diet and let   be the true mean weight of individuals after 3 weeks on the diet. Calculate a 90% confidence interval for the difference between the mean weights before and after the diet is used. Assume that the paired data came from a population that is normally distributed.

Accepted Answer

The answer of A new weight-reducing technique, consisting of a...

Question 19

To construct a confidence interval for the difference of two population proportions the samples must be independently obtained random samples, both must consist of less than 5% of the population, and

Accepted Answer

A)  only one of   (1 -   ) ? 10 or   (1 -   ) ? 10 must be true. 
B)    (1-   )   (1-   )?100. 
C)  both   (1 -   ) ? 10 and   (1 -   ) ? 10 must be true. 
D)    (1-   )+   (1-   )?20. 
A)  only one of   (1 -   ) ? 10 or   (1 -   ) ? 10 must be true. 
B)    (1-   )   (1-   )?100. 
C)  both   (1 -   ) ? 10 and   (1 -   ) ? 10 must be true. 
D)    (1-   )+   (1-   )?20.

Question 20

Data sets A and B are dependent. Test the claim that   =0. Use α = 0.01.   Assume that the paired data came from a population that is normally distributed.

Accepted Answer

test statistic t ≈ -1.215; 0.2

To perform a hypothesis test of two population proportions, the pooled estimate of p must be determined. The pooled estimate, , is

Perform the appropriate hypothesis test. -A random sample of individuals results in successes. An independent sample of individuals results in successes. Does this represent sufficient evidence to conclude that at the α = 0.01 level of significance?

Test the hypothesis that = . Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05.

Data sets A and B are dependent. Find . Assume that the paired data came from a population that is normally distributed.

Test the hypothesis that < . Use α = 0.10. The sample statistics listed below are from independent samples.Sample statistics: = 550, = 121, and = 690, = 195

Find the test statistic to test the hypothesis that = . Two samples are randomly selected from each population. The sample statistics are given below. Use ? = 0.05.

Find the test statistic, z, to test the hypothesis that < . Use ? = 0.10. The sample statistics listed below are from independent samples.Sample statistics: = 550, = 121, and = 690, = 195

Construct a 95% confidence interval for data sets A and B. Data sets A and B are dependent. Assume that the paired data came from a population that is normally distributed.

Find the test statistic, t, to test the hypothesis that ? . Two samples are randomly selected and come from populations that are normal. The sample statistics are given below.

Data sets A and B are dependent. Test the claim that = 0. Use α = 0.05. Assume that the paired data came from a population that is normally distributed.

Test the hypothesis that < . Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05.

What is the for testing differences of the means of two independent samples?

Find the test statistic, z, to test the hypothesis that = . Use ? = 0.05. The sample statistics listed below are from independent samples.Sample statistics: = 50, = 35, and = 60, = 40

To construct a confidence interval for the difference of two population proportions the samples must be independently obtained random samples, both must consist of less than 5% of the population, and

Data sets A and B are dependent. Test the claim that =0. Use α = 0.01. Assume that the paired data came from a population that is normally distributed.

Data Collection

Organizing and Summarizing Data

Numerically Summarizing Data

Describing the Relation Between Two Variables

Probability

Discrete Probability Distributions

The Normal Probability Distributions

Sampling Distributions

Estimating the Value of a Parameter Using Confidence Intervals

Hypothesis Tests Regarding a Parameter

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

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Exam 11: Inference on Two Samples

To perform a hypothesis test of two population proportions, the pooled estimate of p must be determined. The pooled estimate, , is

Perform the appropriate hypothesis test. -A random sample of individuals results in successes. An independent sample of individuals results in successes. Does this represent sufficient evidence to conclude that at the α = 0.01 level of significance?

Test the hypothesis that = . Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05.

Data sets A and B are dependent. Find . Assume that the paired data came from a population that is normally distributed.

Test the hypothesis that < . Use α = 0.10. The sample statistics listed below are from independent samples.Sample statistics: = 550, = 121, and = 690, = 195

Find the test statistic to test the hypothesis that = . Two samples are randomly selected from each population. The sample statistics are given below. Use ? = 0.05.

Find the test statistic, z, to test the hypothesis that < . Use ? = 0.10. The sample statistics listed below are from independent samples.Sample statistics: = 550, = 121, and = 690, = 195

Construct a 95% confidence interval for data sets A and B. Data sets A and B are dependent. Assume that the paired data came from a population that is normally distributed.

Find the test statistic, t, to test the hypothesis that ? . Two samples are randomly selected and come from populations that are normal. The sample statistics are given below.

Data sets A and B are dependent. Test the claim that = 0. Use α = 0.05. Assume that the paired data came from a population that is normally distributed.

Test the hypothesis that < . Two samples are randomly selected from each population. The sample statistics are given below. Use α = 0.05.

What is the for testing differences of the means of two independent samples?

Find the test statistic, z, to test the hypothesis that = . Use ? = 0.05. The sample statistics listed below are from independent samples.Sample statistics: = 50, = 35, and = 60, = 40

To construct a confidence interval for the difference of two population proportions the samples must be independently obtained random samples, both must consist of less than 5% of the population, and

Data sets A and B are dependent. Test the claim that =0. Use α = 0.01. Assume that the paired data came from a population that is normally distributed.

Data Collection

Organizing and Summarizing Data

Numerically Summarizing Data

Describing the Relation Between Two Variables

Probability

Discrete Probability Distributions

The Normal Probability Distributions

Sampling Distributions

Estimating the Value of a Parameter Using Confidence Intervals

Hypothesis Tests Regarding a Parameter

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters