Which Estimated Multiple Regression Allows a Test for Nonlinearity?
A) $\hat { y } = 47 - 12 x _ { 1 } + 8 x _ { 1 } x _ { 2 } - 5 x _ { 2 }$

Multiple Choice

Which estimated multiple regression allows a test for nonlinearity?

A) $\hat { y } = 47 - 12 x _ { 1 } + 8 x _ { 1 } x _ { 2 } - 5 x _ { 2 }$ .
B) $\hat { y } = 47 - 12 x _ { 1 } + 8 x _ { 1 } ^ { 2 } - 5 x _ { 2 } + 25 x _ { 2 } ^ { 2 }$
C) $\hat { y } = 47 - 12 x _ { 1 } + 5 x _ { 2 } + 13 x _ { 3 }$