A physicians group is trying to predict weight from a person

A physicians group is trying to predict weight from a person’s height and a person’s belt size. The multiple regression equation that they found has Y = -87.5 + 2.5X1 + 3X2, where Y = weight in pounds, X1 = height in inches, X2 = belt size in inches. If a person is 72 inches tall and has a belt size of 34 inches, predict how much they would weigh.

Solution

The multiple regression equation that they found has Y = -87.5 + 2.5X1 + 3X2

X1 = height in inches = 72

X2 = belt size in inches = 34

Y = -87.5 + 2.5X1 + 3X2 = -87.5 + 2.5(72)+ 3(34) = 194.5 weight in pounds