In Problem 3.17, we concluded that involuntary smoking was associated with an increased risk of female breast cancer, allowing for the effects of dietary animal fat. Are both variables necessary? The...

In Problem 3.17, we concluded that involuntary smoking was associated with an increased risk of female breast cancer, allowing for the effects of dietary animal fat. Are both variables necessary? The data are in Table D-2, Appendix D.

Table D-2