Assume That You Had Estimated the Following Quadratic Regression Model $\widehat{\text { TestScore }}$

Multiple Choice

Assume that you had estimated the following quadratic regression model $\widehat{\text { TestScore }}$ = 607.3 + 3.85 Income - 0.0423 Income². If income increased from 10 to 11 ($10,000 to $11,000) , then the predicted effect on testscores would be

A) 3.85
B) 3.85-0.0423
C) Cannot be calculated because the function is non-linear
D) 2.96