Examine the following partial output.
a. Which predictor variable best predicts longevity?
b. In this study, exercise is not a statistically significant predictor of longevity. Yet most research has shown exercise to be a significant predictor of longevity. Assume that the sample size on this study is adequate, so sample size cannot explain the result. What aspect of multiple regression research might explain this result?
c. Joe's father died at age 77. On an average day, Joe smokes 20 cigarettes and exercises for 30 minutes. What is Joe's predicted longevity in years?

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Unstandardized Standardized Coefficients Coefficients Beta Model Std. Error Sig 1 (Constant) 448 1.018 .269 112 Same Sex Parent's Longevity Cigarettes Smoked Daily 523 -228 .106 013 044 287