Exam 10: Two-Sample Tests

SCENARIO 10-3 -Referring to Scenario 10-3, suppose α = 0.01.Which of the following represents the result of the Relevant hypothesis test?

SCENARIO 10-7 -True or False: Referring to Scenario 10-7, the null hypothesis should be rejected.

SCENARIO 10-2 A researcher randomly sampled 30 graduates of an MBA program and recorded data concerning their starting salaries.Of primary interest to the researcher was the effect of gender on starting salaries.The result of the pooled-variance t-test of the mean salaries of the females (Population 1)and males (Population 2)in the sample is given below. -Referring to Scenario 10-2, what is the 95% confidence interval estimate for the difference between two means?

In testing for the differences between the means of two independent populations, you assume that the 2 populations each follow a _______ distribution.

SCENARIO 10-9 The following EXCEL output contains the results of a test to determine whether the proportions of satisfied customers at two resorts are the same or different. 10-32 Two-Sample Tests -Referring to Scenario 10-9, allowing for 1% probability of committing a Type I error, what are The decision and conclusion on testing whether there is any difference in the proportions of Satisfied customers in the two resorts?

SCENARIO 10-8 A few years ago, Pepsi invited consumers to take the "Pepsi Challenge." Consumers were asked to decide which of two sodas, Coke or Pepsi, they preferred in a blind taste test.Pepsi was interested in determining what factors played a role in people's taste preferences.One of the factors studied was the gender of the consumer.Below are the results of analyses comparing the taste preferences of men and women with the proportions depicting preference for Pepsi. -Referring to Scenario 10-8, construct a 90% confidence interval estimate of the difference between the proportion of males and females who prefer Pepsi.

SCENARIO 10-3 -Referring to Scenario 10-3, what is the 95% confidence interval estimate for the difference in the two means?

SCENARIO 10-1 Are Japanese managers more motivated than American managers? A randomly selected group of each were administered the Sarnoff Survey of Attitudes Toward Life (SSATL), which measures motivation for upward mobility.The SSATL scores are summarized below. -Referring to Scenario 10-1, give the null and alternative hypotheses to determine if the mean SSATL score of Japanese managers differs from the mean SSATL score of American managers.

SCENARIO 10-7 -Referring to Scenario 10-7, what is the 90% confidence interval estimate for the mean difference in prices?

SCENARIO 10-8 A few years ago, Pepsi invited consumers to take the "Pepsi Challenge." Consumers were asked to decide which of two sodas, Coke or Pepsi, they preferred in a blind taste test.Pepsi was interested in determining what factors played a role in people's taste preferences.One of the factors studied was the gender of the consumer.Below are the results of analyses comparing the taste preferences of men and women with the proportions depicting preference for Pepsi. -Referring to Scenario 10-8, to determine if a difference exists in the taste preferences of men And women, give the correct alternative hypothesis that Pepsi would test.

SCENARIO 10-3 -Referring to Scenario 10-3, suppose = 0.10.Which of the following represents the result of the Relevant hypothesis test?

SCENARIO 10-7 -Referring to Scenario 10-7, the test to perform is a

In testing for the differences between the means of two related populations, the _______ hypothesis is the hypothesis of "no differences."

SCENARIO 10-5 10-16 Two-Sample Tests -Referring to Scenario 10-5, at the 0.05 level of significance, the conclusion for this hypothesis Test is that there is sufficient evidence that:

True or False: A Marine drill instructor recorded the time in which each of 11 recruits completed an obstacle course both before and after basic training.To test whether any improvement occurred, the instructor would use a t-distribution with 10 degrees of freedom.

SCENARIO 10-4 Two samples each of size 25 are taken from independent populations assumed to be normally distributed with equal variances.The first sample has a mean of 35.5 and standard deviation of 3.0 while the second sample has a mean of 33.0 and standard deviation of 4.0. -Referring to Scenario 10-4, there are _______ degrees of freedom for this test.

True or False: A researcher is curious about the effect of sleep on students' test performances.He chooses 60 students and gives each two tests: one given after two hours' sleep and one after eight hours' sleep.The test the researcher should use would be a related samples test.

True or False: A Marine drill instructor recorded the time in which each of 11 recruits completed an obstacle course both before and after basic training.To test whether any improvement occurred, the instructor would use a t-distribution with 11 degrees of freedom.