Refer to Exercise 13.81.
a. Is reading scores, % minority, or % poverty the best predictor of math scores?
b. Estimate the average math score for a third- grade class having a reading score of 170, % minority of 40%, and % poverty of 30%. Provide both a point estimator and a 95% confidence interval.
c. Repeat the question in part (b) for both fourth- and fifth- grade classes. How different were your point estimators for the three grade levels?