Weight and IQ Repeat Exercise 14 “Weight and IQ” using all of the weights and IQ scores in Data Set 9 “IQ and Brain Size” in Appendix B. Large Data Sets. Exercises 25–32 use the same Appendix B data sets as Exercises 25–32 in Section 10-1. In each case, find the regression equation, letting the first variable be the predictor (x) variable. Find the indicated predicted values following the prediction procedure summarized in Figure 10-5 on page 466.