Assume that you are part of a committee to choose a new textbook among 3 books: Book A, Book B, and Book C. Luckily, a researcher has recently done an experiment where she randomly assigned participants into 3 groups, with members of each group reading either Book A, Book B or Book C. Participants were required to read the section on errors in hypothesis testing and to take a brief quiz on the concept. The number correct answers on the quiz are listed below.

Book A Book B Book C

8 10 12

7 8 10

6 9 9

7 9 11

5 8 8

7 10 10

T= 40 T=54 T=60

SS = 5.33 SS=4 SS=10

1. Another committee member looks at the totals for each group and claims that Book C looks like it’s the best. You correct her and tell her that you can’t tell just by looking at the totals. Why can’t you just use the totals?
2. What do you need to do instead?
3. What are the IV and the DV?
4. What kinds of errors might occur in the process that you suggested in #2? Describe them in terms of the IV and DV. How might you control these errors?
5. What statistics would you use to describe the results for each group and why?
6. Calculate them.
7. What inferential statistical test would you use to analyze your data and why?
8. Calculate that statistical test. (Show all steps)
9. What is your decision about the books based on your statistical test?
10. Can you make a final choice about the books after your first test? Why or why not?
11. What further test(s) might you need to do?
12. Calculate this(these) test (s).

12. Report the results as a committee recommendation.

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