For the lung function data described in Appendix A, find the regression of FEV1 on weight and height for the fathers. Divide each of the two explanatory variables into two intervals: greater than, and...

For the lung function data described in Appendix A, find the regression of FEV1 on weight and height for the fathers. Divide each of the two explanatory variables into two intervals: greater than, and less than or equal to the respective median. Is there an interaction between the two explanatory variables?

Q56;

Continuation of Problem 8.13.) Find the partial correlation of FEV1 and age given height for the oldest child, and compare it to the simple correlation between FEV1 and age of the oldest child. Is either one significantly different from zero? Based on these results and without doing any further calculations, comment on the relationship between OCHEIGHT and OCAGE in these data

PROBLEM 8.13

For the lung function data described in Appendix A, find the regression of FEV1 on weight and height for the fathers. Divide each of the two explanatory variables into two intervals: greater than, and less than or equal to the respective median. Is there an interaction between the two explanatory variables?