※ 引述《chrisjon (恬静悠闲)》之铭言： : 考虑模型 : Yi = β0 + β1X1 + β2(X1^2) +εi : ︿ : Yi = 729.86 - 10.887*X1 + 0.046*X2 : Yi = Number of Packages Sold : X1 = Price : X1^2 = Price^2 : Five stores were randomly assigned to each of three different price : (79,99 and 119) levels for a package of three azors. : (怕翻译出错，所以重点post) : b) Explain the meaning of the regression coefficients : 因为什麽都没说就叫我们解释，所以我想应该是问R^2 : 但是 不对。 是叫你解释x_1 or x_2每变动一单位时，y会变动几单位。 : e) Compute the coefficient of multiple determination, : and interpret its meaning : 这是问R^2 吧? 让我很困惑~.~? 判定系数。然後你要解释模型中的R^2代表什麽意义。 : d) Determine whether there is a significant second-degree : polynomial relationship between price and sales : 这是要整体F检定，还是要检定二次项β2 偏F检定? 用t-test不行吗？H_0: beta_2=0 : second-degree是 二次项 的意思吗? 是的。x_2=x_1^2 --

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