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hypothesis about a mean and...

Assume that the data you have collected is testing a hypothesis about a mean and n = 107. Find the critical value used to test a null hypothesis.

α = 0.05 for a left-tailed test.

Assume that the data you have collected is testing a hypothesis about a mean and n = 18. Find the critical value used to test a null hypothesis.

α = 0.05 for a two-tailed test

Determine the decision criterion for rejecting the null hypothesis in the given hypothesis test; i.e., describe the values of the test statistic that would result in rejection of the null hypothesis.

Suppose you wish to test the claim that μd, the mean value of the differences d for a population of paired data, is different from 0. Given a sample of n = 23 and a significance level of α = 0.05, what criterion would be used for rejecting the null hypothesis?

Determine whether the samples are independent or matched pairs.

The effectiveness of a new headache medicine is tested by measuring the amount of time before the headache is cured for patients who use the medicine and another group of patients who use a placebo drug.

Assume that the data you have collected is testing a hypothesis about a proportion. Calculate the test statistic. Round your answer to two decimal places.

A medical school claims that at least 28% of its students plan to go into general practice. It is found that among a random sample of 120 of the school's students, 20% of them plan to go into general practice.

Assume that the data you have collected is testing a hypothesis about a mean. Calculate the test statistic. Round your answer to two decimal places.

A national car insurance company stated that in 1987, the average yearly car insurance cost for a family in the U.S. was $1716 with a standard deviation of $35.50. In the same year, a random sample of 32 families in California resulted in an average cost of $1761.

Assume that you want to test the claim that the paired sample data come from a population for which the mean difference is μd = 0. Calculate the value of the test statistic. Round your answer to two decimal places. Assume the standard deviation of the differences is 3.11.

X 7, 6, 7, 3, 9

Y 4, 8, 3, 4, 4

α = 0.05 for a left-tailed test.

Assume that the data you have collected is testing a hypothesis about a mean and n = 18. Find the critical value used to test a null hypothesis.

α = 0.05 for a two-tailed test

Determine the decision criterion for rejecting the null hypothesis in the given hypothesis test; i.e., describe the values of the test statistic that would result in rejection of the null hypothesis.

Suppose you wish to test the claim that μd, the mean value of the differences d for a population of paired data, is different from 0. Given a sample of n = 23 and a significance level of α = 0.05, what criterion would be used for rejecting the null hypothesis?

Determine whether the samples are independent or matched pairs.

The effectiveness of a new headache medicine is tested by measuring the amount of time before the headache is cured for patients who use the medicine and another group of patients who use a placebo drug.

Assume that the data you have collected is testing a hypothesis about a proportion. Calculate the test statistic. Round your answer to two decimal places.

A medical school claims that at least 28% of its students plan to go into general practice. It is found that among a random sample of 120 of the school's students, 20% of them plan to go into general practice.

Assume that the data you have collected is testing a hypothesis about a mean. Calculate the test statistic. Round your answer to two decimal places.

A national car insurance company stated that in 1987, the average yearly car insurance cost for a family in the U.S. was $1716 with a standard deviation of $35.50. In the same year, a random sample of 32 families in California resulted in an average cost of $1761.

Assume that you want to test the claim that the paired sample data come from a population for which the mean difference is μd = 0. Calculate the value of the test statistic. Round your answer to two decimal places. Assume the standard deviation of the differences is 3.11.

X 7, 6, 7, 3, 9

Y 4, 8, 3, 4, 4

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