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The polynomial regression model of degree r is given by Yi = Bo+ BIXi+ B2X, + . .. + B,XI + ui. (a) Interpret the

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The polynomial regression model of degree r is given by Yi = Bo+ BIXi+ B2X, + . .. + B,XI + ui. (a) Interpret the coefficient 3, in a linear regression (r = 1): Yi = Bo+ BIXitui and in a quadratic regression (r = 2): Yi = Bo+ BIXi+ B2X; + ui

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