Question 1

Find the test statistic   for a sample with n = 12,   = 27.2, s = 2.2, and ? = 0.01 if   Round your answer to three decimal places.

Accepted Answer

A)  2.001 
B)  1.991 
C)  1.890 
D)  2.132 
A)  2.001 
B)  1.991 
C)  1.890 
D)  2.132 C

Question 2

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested.
-

Accepted Answer

A)  Left-tailed, p 
B)  Right-tailed,   
C)  Right-tailed, p 
D)  Left-tailed,   
A)  Left-tailed, p 
B)  Right-tailed,   
C)  Right-tailed, p 
D)  Left-tailed,   C

Question 3

The weights (in ounces) of a sample of tomatoes of a particular variety are summarized in the boxplot below. Based on the boxplot, is a large sample necessary to conduct a hypothesis test about the mean weight? If so, why?

Accepted Answer

A)  Yes; data do not appear to be normally distributed but skewed right. 
B)  Yes; data contain outliers. 
C)  Yes; data do not appear to be normally distributed but skewed left. 
D)  No; data appear to be normally distributed with no outliers. 
A)  Yes; data do not appear to be normally distributed but skewed right. 
B)  Yes; data contain outliers. 
C)  Yes; data do not appear to be normally distributed but skewed left. 
D)  No; data appear to be normally distributed with no outliers. B

Question 4

If I specify ? to be equal to 0. 29, then the value of ? must be 0. 71.

Accepted Answer

A) True 
 B)False

Question 5

A method currently used by doctors to screen women for possible breast cancer fails to detect cancer in 20% of the women who actually have the disease. A new method has been developed that researchers hope will be able to detect cancer more accurately. A random sample of 90 women known to have breast cancer were screened using the new method. Of these, the new method failed to detect cancer in 10. Is the sample size sufficiently large in order to conduct this test of hypothesis? Explain. Round to the nearest thousandth.

Accepted Answer

@#IMG-DLM& Since this interval does not

Question 6

In 2010, the mean expenditure for auto insurance in a certain state was $806. An insurance salesperson in this state believes that the mean expenditure for auto insurance is less today. She obtains a simple random sample of 32 auto insurance policies and determines the mean expenditure to be $781 with a standard deviation of $39.13. Is there enough evidence to support the claim that the mean expenditure for auto insurance is less than the 2010 amount at the ? = 0.05 level of significance?

Accepted Answer

The answer of In 2010, the mean expenditure for auto...

Question 7

Find the test statistic   for a sample with n = 15,   = 10.6, s = 0.8, and   if   Round your answer to three decimal places.

Accepted Answer

A)  1.631 
B)  1.728 
C)  1.312 
D)  1.452 
A)  1.631 
B)  1.728 
C)  1.312 
D)  1.452

Question 8

Determine the test statistic, z, to test the claim about the population proportion p ? 0.700 given   and   Use

Accepted Answer

A)  -2.18 
B)  -1.28 
C)  -1.36 
D)  -3.01 
A)  -2.18 
B)  -1.28 
C)  -1.36 
D)  -3.01

Question 9

A nationwide survey claimed that at least 55% of parents with young children condone spanking their child as a regular form of punishment. In a random sample of 100 parents with young children, how many would need to say that they condone spanking as a form of punishment in order to refute the claim at

Accepted Answer

A)  You would need exactly 46 parents to support spanking to refute the claim. 
B)  You would need more than 46 parents to support spanking to refute the claim. 
C)  You would need 47 or less parents to support spanking to refute the claim. 
D)  You would need 46 or less parents to support spanking to refute the claim. 
A)  You would need exactly 46 parents to support spanking to refute the claim. 
B)  You would need more than 46 parents to support spanking to refute the claim. 
C)  You would need 47 or less parents to support spanking to refute the claim. 
D)  You would need 46 or less parents to support spanking to refute the claim.

Question 10

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested.
-

Accepted Answer

A)  Two-tailed,   
B)  Right-tailed, ? 
C)  Left-tailed,   
D)  Two-tailed, ? 
A)  Two-tailed,   
B)  Right-tailed, ? 
C)  Left-tailed,   
D)  Two-tailed, ?

Question 11

A relative frequency histogram for the sale prices of homes sold in one city during 2010 is shown below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean sale price? If so, why?

Accepted Answer

A)  Yes; data do not appear to be normally distributed but bimodal. 
B)  No; data appear to be normally distributed. 
C)  Yes; data do not appear to be normally distributed but skewed left. 
D)  Yes; data do not appear to be normally distributed but skewed right. 
A)  Yes; data do not appear to be normally distributed but bimodal. 
B)  No; data appear to be normally distributed. 
C)  Yes; data do not appear to be normally distributed but skewed left. 
D)  Yes; data do not appear to be normally distributed but skewed right.

Question 12

The ages of a group of patients being treated at one hospital for osteoporosis are summarized in the frequency histogram below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean age? If so, why?

Accepted Answer

A)  No; data appear to be normally distributed with no outliers. 
B)  Yes; data do not appear to be normally distributed but skewed left. 
C)  Yes; data do not appear to be normally distributed but bimodal. 
D)  Yes; data do not appear to be normally distributed but skewed right. 
A)  No; data appear to be normally distributed with no outliers. 
B)  Yes; data do not appear to be normally distributed but skewed left. 
C)  Yes; data do not appear to be normally distributed but bimodal. 
D)  Yes; data do not appear to be normally distributed but skewed right.

Question 13

Use a t-test to test the claim μ < 5.9 at α = 0.10, given the sample statistics n = 20,   , and   Round the test statistic to the nearest thousandth.

Accepted Answer

test statistic ≈ -0.894, 0.15

Question 14

Use a t-test to test the claim μ = 23 at α = 0.01, given the sample statistics n = 12,   = 24.2, and   Round the test statistic to the nearest thousandth.

Accepted Answer

test statistic ≈ 1.890, 0.05 <

Question 15

The dean of a major university claims that the mean number of hours students study at her University (per day) is at most 3.4 hours. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?

Accepted Answer

A)  There is sufficient evidence to reject the claim ? ? 3.4. 
B)  There is sufficient evidence to support the claim ? ? 3.4. 
C)  There is not sufficient evidence to support the claim ? ? 3.4. 
D)  There is not sufficient evidence to reject the claim ? ? 3.4. 
A)  There is sufficient evidence to reject the claim ? ? 3.4. 
B)  There is sufficient evidence to support the claim ? ? 3.4. 
C)  There is not sufficient evidence to support the claim ? ? 3.4. 
D)  There is not sufficient evidence to reject the claim ? ? 3.4.

Question 16

Use a t-test to test the claim μ = 24.1 at α = 0.01, given the sample statistics n = 12,   = 23.6, and   Round the test statistic to the nearest thousandth.

Accepted Answer

test statistic ≈ -0.825, 0.40

Question 17

We never conclude "Accept   " in a test of hypothesis. This is because:

Accepted Answer

A)  ? = p(Type II error) is not known. 
B)  The rejection region is not known. 
C)  The p-value is not small enough. 
D)  ? is the probability of a Type I error. 
A)  ? = p(Type II error) is not known. 
B)  The rejection region is not known. 
C)  The p-value is not small enough. 
D)  ? is the probability of a Type I error.

Question 18

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested.
-

Accepted Answer

A)  Right-tailed, ? 
B)  Left-tailed, ? 
C)  Left-tailed, s 
D)  Right-tailed, ? 
A)  Right-tailed, ? 
B)  Left-tailed, ? 
C)  Left-tailed, s 
D)  Right-tailed, ?

Question 19

A method currently used by doctors to screen women for possible breast cancer fails to detect cancer in 15% of the women who actually have the disease. A new method has been developed that researchers hope will be able to detect cancer more accurately. A random sample of 70 women known to have breast cancer were screened using the new method. Of these, the new method failed to detect cancer in 8. Calculate the test statistic used by the researchers for this test of hypothesis. Round to the nearest thousandth.

Accepted Answer

The answer of A method currently used by doctors to...

Question 20

A pharmaceutical company manufactures a 81-mg pain reliever. Company specifications include that the standard deviation of the amount of the active ingredient must not exceed 2 mg. The quality-control manager selects a random sample of 30 tablets from a certain batch and finds that the standard deviation is 2.4 mg. Assume that the amount of the active ingredient is normally distributed. Test the claim that the standard deviation of the amount of the active ingredient is greater than 2 mg at the ? = 0.05 level of significance.

Accepted Answer

The answer of A pharmaceutical company manufactures a 81-mg pain...

Find the test statistic for a sample with n = 12, = 27.2, s = 2.2, and ? = 0.01 if Round your answer to three decimal places.

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested. -

The weights (in ounces) of a sample of tomatoes of a particular variety are summarized in the boxplot below. Based on the boxplot, is a large sample necessary to conduct a hypothesis test about the mean weight? If so, why?

If I specify ? to be equal to 0. 29, then the value of ? must be 0. 71.

Find the test statistic for a sample with n = 15, = 10.6, s = 0.8, and if Round your answer to three decimal places.

Determine the test statistic, z, to test the claim about the population proportion p ? 0.700 given and Use

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested. -

A relative frequency histogram for the sale prices of homes sold in one city during 2010 is shown below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean sale price? If so, why?

The ages of a group of patients being treated at one hospital for osteoporosis are summarized in the frequency histogram below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean age? If so, why?

Use a t-test to test the claim μ < 5.9 at α = 0.10, given the sample statistics n = 20, , and Round the test statistic to the nearest thousandth.

Use a t-test to test the claim μ = 23 at α = 0.01, given the sample statistics n = 12, = 24.2, and Round the test statistic to the nearest thousandth.

The dean of a major university claims that the mean number of hours students study at her University (per day) is at most 3.4 hours. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?

Use a t-test to test the claim μ = 24.1 at α = 0.01, given the sample statistics n = 12, = 23.6, and Round the test statistic to the nearest thousandth.

We never conclude "Accept " in a test of hypothesis. This is because:

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested. -

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

Inference on Two Samples

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters

Exam 10: Hypothesis Tests Regarding a Parameter

Find the test statistic for a sample with n = 12, = 27.2, s = 2.2, and ? = 0.01 if Round your answer to three decimal places.

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested. -

The weights (in ounces) of a sample of tomatoes of a particular variety are summarized in the boxplot below. Based on the boxplot, is a large sample necessary to conduct a hypothesis test about the mean weight? If so, why?

If I specify ? to be equal to 0. 29, then the value of ? must be 0. 71.

Find the test statistic for a sample with n = 15, = 10.6, s = 0.8, and if Round your answer to three decimal places.

Determine the test statistic, z, to test the claim about the population proportion p ? 0.700 given and Use

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested. -

A relative frequency histogram for the sale prices of homes sold in one city during 2010 is shown below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean sale price? If so, why?

The ages of a group of patients being treated at one hospital for osteoporosis are summarized in the frequency histogram below. Based on the histogram, is a large sample necessary to conduct a hypothesis test about the mean age? If so, why?

Use a t-test to test the claim μ < 5.9 at α = 0.10, given the sample statistics n = 20, , and Round the test statistic to the nearest thousandth.

Use a t-test to test the claim μ = 23 at α = 0.01, given the sample statistics n = 12, = 24.2, and Round the test statistic to the nearest thousandth.

The dean of a major university claims that the mean number of hours students study at her University (per day) is at most 3.4 hours. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?

Use a t-test to test the claim μ = 24.1 at α = 0.01, given the sample statistics n = 12, = 23.6, and Round the test statistic to the nearest thousandth.

We never conclude "Accept " in a test of hypothesis. This is because:

The null and alternative hypotheses are given. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed and the parameter that is being tested. -

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

Inference on Two Samples

Inference on Categorical Data

Comparing Three or More Means

Inference of the Least-Squares Regression Model

Filters