The data from Exercise 14 31 for the ages at inauguration
The data from Exercise 14.31 for the ages at inauguration and of death for the presidents of the United States are on the WeissStats CD.
a. Decide whether you can reasonably apply the regression t-test. If so, then also do part (b).
b. Decide, at the 5% significance level, whether the data provide sufficient evidence to conclude that the predictor variable is useful for predicting the response variable.
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