Predicting Nicotine in Cigarettes Refer to Data Set 15 “Cigarette Contents” in Appendix B and use the tar, nicotine, and CO amounts for the cigarettes that are 100 mm long, filtered, nonmenthol, and nonlight (the last set of measurements). Find the best regression equation for predicting the amount of nicotine in a cigarette using the predictor variables of (1)

tar; (2) carbon monoxide; (3) tar and carbon monoxide. Why is it best? Is the best regression equation a good regression equation for predicting the nicotine content? Why or why not? Appendix B Data Sets. In Exercises 13–16, refer to the indicated data set in Appendix B and use technology to obtain results.