# 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.

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.

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.

## Answer to relevant Questions

The data from Exercise 4.66 for percentage of gross domestic product (GDP) spent on health care and life expectancy, in years, for selected countries are on the WeissStats CD. Do the required parts separately for each ...A small company has purchased a microcomputer system for $7200 and plans to depreciate the value of the equipment by $1200 per year for 6 years. Let x denote the age of the equipment, in years, and y denote the value of the ...In the context of regression analysis, what is an a. Outlier? b. Influential observation? The random variable X is the crew size of a randomly selected shuttle mission between April 1981 and July 2000. Its probability distribution is as follows. a. Find and interpret the mean of the random variable. b. Obtain the ...An American roulette wheel contains 38 numbers: 18 are red, 18 are black, and 2 are green. When the roulette wheel is spun, the ball is equally likely to land on any of the 38 numbers. Suppose that you bet $1 on red. If the ...Post your question

0