LaTawna runs a used textbook business near City University. One semester, she sells 882 used textbooks to City University students. Of these, 387 are for 100-level, 147 for 200-level, 180 for 300-level, 135 for 400-level, and 33 for 500-level courses. During the same time period, City University’s on-campus bookstore sells the following percentage of used textbooks: 37% for 100-level, 18% for 200-level, 10% for 300-level, 19% for 400-level, and 16% for 500-level courses.

a. State the research hypothesis.

b. What is the df for this study?

c. Complete the following table:

d. Calculate χ².

e. Interpret the result at the .01 error level. Is the research hypothesis supported?

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100 Level No. No. Obs. Exp. 200 Level No. No. Obs. Exp. 300 Level 400 Level No. No. No. Exp. Obs. Exp. No. Obs. 500 Level No. Obs. No. Exp.