SOC

a. The student body at St. Algebra College attends an average of 3.3 parties per month.

A random sample of 117 sociology majors averages 3.8 parties per month with a standard deviation of 0.53. Are sociology majors signifi cantly different from the student body as a whole? [HINT: The wording of the research question suggests a two-tailed test. This means that the alternative or research hypothesis in Step 2 will be stated as H1

: µ ≠ 3.3 and that the critical region will be split between the upper and lower tails of the sampling distribution.

[See Table 7.2 for values of Z(critical) for various alpha levels.]

b. What if the research question were changed to “Do sociology majors attend a signifi cantly greater number of parties”? How would the test conducted in 8.2a change? [HINT: This wording implies a one-tailed test of signifi cance. How would the research hypothesis change? For the alpha you used in Problem 8.2a, what would the value of Z(critical) be? ]