Chapter 4: Q. 4.124 (page 189)
A value of close to indicates that the regression equation is either useless or ----- for making predictions.
Poor
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7. Identify one use of a regression equation.
Corvette Prices. In Exercise 4.59. you determined a regression equation that can be used to predict the price of a Corvette, given its age.
a. Should that regression equation be used to predict the price of a 4-year-old Corvette? a 10-year-old Corvette? Explain your answers.
b. For which ages is the use of the regression equation to predict price reasonable?
11. Using a regression equation to make predictions for values of the predictor variable outside the range of the observed values of the predictor variable is called ________
Birdies and Score. The data from Exercise 4.70 for number of birdies during a tournament and final score for women golfers are on the WeissStats site.
a. decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate, If so, then also do parts (b) and (c).
b. obtain the linear correlation coefficient.
c. interpret the value of in terms of the linear relationship between the two variables in question.
For each of the sums of squares in regression, state its name and what it measures,
a. SST
b. SSR
c. SSE
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