Question: 18. We ask whether attending a private school leads to higher or lower performance on a test of social skills. A sample of 100 students

18. We ask whether attending a private school leads to higher or lower performance on a test of social skills. A sample of 100 students from a private school produces a mean of 71.30 on the test, and the national mean for students from public schools is 75.62 (a^ = 28.0).

(a) Should we use a one-tailed or a two-tailed test? Why?

(b) What are and 7/J

(c) Compute

(d) With a = .05, what is

(e) What should we conclude about this relationship?

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