Concept explainers
To explain:whether it is correct to use the regression line to predict y from x
Answer to Problem 62E
It would not be appropriate to use the regression line to predict Y from X.
Explanation of Solution
Given:
The regression line is
The displayed residual plot in effect turns the regression line horizontal. It magnifies the deviations of the points from the line, if the regression line captures the overall pattern of the data, there should be no pattern in the residuals.
The figure shows a residual plot with a clear curved pattern. A straight line is not an appropriate model for these data. Hence, it would not be appropriate to use the regression line to predict Y from X.
Chapter 3 Solutions
The Practice of Statistics for AP - 4th Edition
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