Question: The data from Exercise 4.65 for the ages at inauguration and of death for the presidents of the United States are on the WeissStats CD.

The data from Exercise 4.65 for the ages at inauguration and of death for the presidents of the United States are on the WeissStats CD.
a. Decide whether finding a regression line for the data is reasonable. If so, then also do parts (b)–(d).
b. Obtain the coefficient of determination.
c. Determine the percentage of variation in the observed values of the response variable explained by the regression, and interpret your answer.
d. State how useful the regression equation appears to be for making predictions.

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