College dropout study. Refer to the American Economic Review (December 2008) study of college dropouts, Exercise 2.79 (p. 87). Recall that one factor though; to influence the college dropout decision was expected GPA for a student who studied 3 hours per day. In a representative sample of 307 college students who studied 3 hours per day, the
- a. Give a point estimate for µ.
- b. Give an
interval estimate for µ. Use a confidence coefficient of .98. - c. Comment on the validity of the following statement: “98% of the time, the true mean GPA will fall in the interval computed in part b.”
- d. It is unlikely that the GPA values for college students who study 3 hours per day are
normally distributed . In fact, it is likely that the GPA distribution is highly skewed. If so, what impact, if any, does this have on the validity of inferences derived from the confidence interval?
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