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Coefficient of determination

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A metropolitan economist is attempting to predict the average total budget of retired couples in Phoenix, based on average U.S. urban retired couples' total budget. An r2 of .7824 is obtained. Will the regression be a good predictive model?

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Explanation for coefficient of determination (R square) is given in the solution.

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Regression
A metropolitan economist is attempting to predict the average total budget of retired couples in ...

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