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Last fall, a sample of n=36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of the freshman class. All freshman must take the same English Language Skills course, and the mean score on the final exam for the entire freshman class was u=74. The students in the new program had a mean score of M=79.4 with a standard deviation of s=18.
a. On the basis of these data, can the college conclude that the students in the new program performed significantly better than the rest of the freshman class? Use a one-tailed test with an alpha level of .05.
b. Can the college conclude that the students in the new program are significantly different from the freshman class? Use a two-tailed test with an alpha level of .05?
Ms Moline is the budget director for Nexus Media Inc. She is comparing travel costs for sales and the audit staff. She collected the following sample data:
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A newspaper article discussed the opening of a Whole Foods Market in the Time=Warner building in NYC. What assumption is necessary about the population distribution in order to perform the test
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