Suppose you fit the​ first-order multiple regression model y = β0+β1×1+β2×2+ε to n=25 data points and obtain the prediction equation y with caret equals = negative 90.91+6.77 x 1 plus 1.9 x 2−90.91+6.77×1+1.9×2. The estimated standard deviations of the sampling distributions of beta 1β1 and beta 2β2 are 1.35 and 0.27​, respectively.

a.

nothing

.

b.