From the point of view of designing a valid experiment an important difference exists between Exercise 19.1 and a similar example used in this chapter. The data in Exercise 19.1 will not really answer the question that the chair wants answered. What is the problem, and how could the experiment be improved?

Exercise 19.1

The chair of a psychology department suspects that some of his faculty are more popular than others. There are three sections of Introductory Psychology (taught at 10:00 a.m., 11:00 a.m., and noon) by Professors Anderson, Klansky, and Kamm. The number of students who enroll for each section are given.

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Professor Anderson Professor Professor Klansky Kamm 25 32 10 Run the appropriate chi-square test and interpret the results.