Exhibit 10

question 88

Multiple Choice

Exhibit 10.7.A stats professor at a large university hypothesizes that students who take statistics in the morning typically do better than those who take it in the afternoon.He takes independently random samples,each of size 36,consisting of students who took a morning and an afternoon class,and compares the scores of each group on a common final exam.He finds that the morning group scored an average of 74 with a standard deviation of 8,while the evening group scored an average of 68 with a standard deviation of 10.The population standard deviation of scores is unknown,but assumed to be equal for morning and evening classes.Let and represent the population mean final exam scores of statistics' courses offered in the morning and the afternoon,respectively Refer to Exhibit 10.7.What is the appropriate critical value(s) to test the professor's claim at the 1% significance level?

• A)-2.381 and 2.381
• B)-2.326 and 2.326
• C)2.326
• D)2.381

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