The campus bookstore at a local university is interested in finding out whether the textbook preference and the class level (freshman, sophomore, junior, senior) of the student are associated. A random sample of 100 students is obtained, and each student in the sample is asked which textbook he or she prefers: new books, used books, or digital books. The students are also asked whether their class level is freshman, sophomore, junior, or senior. Which of the following is the appropriate test for the investigation?     A one-sample tt-test for a population mean A A two-sample tt-test for a difference between means B A chi-square goodness-of-fit test C A chi-square test of homogeneity D A chi-square test of independence

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