When public opinion surveys are conducted by mail
12.11 When public opinion surveys are conducted by mail, a cover letter explaining the purpose of the survey is usually included. To determine whether the wording of the cover letter influences the response rate, three different cover letters were used in a survey of students at a Mid- western university (“The Effectiveness of Cover-Letter Appeals,” Journal of Social Psychology [1984]: 85–91).
Suppose that each of the three cover letters accompanied questionnaires sent to an equal number of randomly se- lected students. Returned questionnaires were then classi- fied according to the type of cover letter (I, II, or III). Use the accompanying data to test the hypothesis that p1 = 1/3, p2 = 1/3, and p3 = 1/3, where p1, p2, and p3 are the true proportions of all returned questionnaires accompanied by cover letters I, II, and III, respectively. Use a .05 signifi- cance level.
Mendel’s laws of inheritance imply that p1 = 9/16, p2 = 3/16, p3 = 3/16, and p4 = 1/16. Are the data from this experiment consistent with Mendel’s laws? Use a .01 sig- nificance level.
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