Find the best predicted new mileage rating of a Jeep Grand Cherokee given that the old rating
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Find the best predicted new mileage rating of a Jeep Grand Cherokee given that the old rating is 19 mi gal. Is the predicted value close to the actual value of 17 mi/gal?
In each case, find the regression equation, letting the first variable be the predictor (x) variable. Find the indicated predicted value by following the prediction procedure summarized in Figure 10-5.
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Old New 16 27 17 33 28 24 18 22 20 29 21 15 24 15 29 25 22 16 20 18 26 19 Yes. The regression equation is a good model. Strategy for Predicting Values of Y Is the regression equation a good model? • The regression line graphed in the scatterplot shows that the line fits the points well. • r indicates that there is a linear correlation. • The prediction is not much beyond the scope of the available sample data. Substitute the given value of x into the regression equation ŷ = b + b₁x. No. The regression equation is not a good model. Regardless of the value of x, the best predicted value of y is the value of y (the mean of the y values). Figure 10-5 Recommended Strategy for Predicting Values of y
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