Question 1

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.
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Accepted Answer

D

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.
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Accepted Answer

C

Question 3

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.
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Accepted Answer

B

Question 4

A local tennis pro-shop strings tennis rackets at the tension (pounds per square inch) requested by the customer. Recently a customer made a claim that the pro-shop consistently strings rackets at lower tensions, on average, than requested. To support this claim, the customer asked the pro shop to string 20 new rackets at 58 psi. Upon receiving the rackets, the customer measured the tension of each and calculated the following summary statistics:   In order to conduct the test, the customer selected a significance level of  Interpret this value.

Accepted Answer

The answer of A local tennis pro-shop strings tennis rackets...

Question 5

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

Accepted Answer

The statement seems to imply a relationship where two values sum to 1, but specifying ? to be equal to 0.29 does not necessitate that its counterpart must be 0.71 without additional context or a defined relationship.

Question 6

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

Accepted Answer

The answer of We never conclude "Accept  " in...

Question 7

The dean of a major university claims that the mean number of hours students study at her University (per day) is at most 5.8 hours. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

Accepted Answer

Rejecting the null hypothesis means there is sufficient evidence to support the alternative hypothesis, which contradicts the claim that the mean number of hours students study is at most 5.8 hours.

Question 8

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

Failing to reject the null hypothesis means there isn't enough evidence to support a conclusion contrary to it, thus not enough evidence to reject the claim that the mean study hours per day is at most 3.4 hours.

Question 9

A candidate for state representative of a certain state claims to be favored by at least half of the voters. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

Accepted Answer

Rejecting the null hypothesis indicates there is sufficient evidence to reject the claim that the candidate is favored by at least half of the voters (p ≥ 0.5).

Question 10

A candidate for state representative of a certain state claims to be favored by at least half of the voters. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?

Accepted Answer

Failing to reject the null hypothesis means there is not enough evidence to conclude that the candidate is not favored by at least half of the voters.

Question 11

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

The answer of A nationwide survey claimed that at least...

Question 12

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 13

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

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

Question 14

Determine the critical value,  , to test the claim about the population proportion p ? 0.132 given  and  Use

Accepted Answer

The answer of Determine the critical value,  , to...

Question 15

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

Accepted Answer

The answer of Determine the test statistic, z, to test...

Question 16

Test the claim about the population proportion p = 0.250 given n = 48 and  = 0.231. Use α = 0.01.

Accepted Answer

The answer of Test the claim about the population proportion...

Question 17

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

The answer of A relative frequency histogram for the sale...

Question 18

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

The answer of The ages of a group of patients...

Question 19

The weekly salaries (in dollars) of randomly selected employees of a company are summarized in the boxplot below. Based on the boxplot, is a large sample necessary to conduct a hypothesis test about the mean salary? If so, why?

Accepted Answer

The answer of The weekly salaries (in dollars) of randomly...

Question 20

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

The answer of The weights (in ounces) of a sample...

Quiz 10: Hypothesis Tests Regarding a Parameter

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 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 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. -

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

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

The dean of a major university claims that the mean number of hours students study at her University (per day) is at most 5.8 hours. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

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?

A candidate for state representative of a certain state claims to be favored by at least half of the voters. If a hypothesis test is performed, how should you interpret a decision that rejects the null hypothesis?

A candidate for state representative of a certain state claims to be favored by at least half of the voters. If a hypothesis test is performed, how should you interpret a decision that fails to reject the null hypothesis?

Determine the critical value, , to test the claim about the population proportion p ? 0.132 given and Use

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

Test the claim about the population proportion p = 0.250 given n = 48 and = 0.231. Use α = 0.01.

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?

The weekly salaries (in dollars) of randomly selected employees of a company are summarized in the boxplot below. Based on the boxplot, is a large sample necessary to conduct a hypothesis test about the mean salary? If so, why?

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?