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The estimated cubic regression function relating income to test scores is TestScore = 600.1 + 5.02Income - 0.096Income + 0.00069Income. (5.1) (0.71) (0.029) (0.00035) The

The estimated cubic regression function relating income to test scores is TestScore = 600.1 + 5.02Income - 0.096Income + 0.00069Income. (5.1) (0.71) (0.029) (0.00035) The values in parenthesis are the standard errors of coefficient esti- mates. Test the null hypothesis that the regression function is quadratic against the alternative that it is cubic

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