Question: Using the donations database on the companion site, and using only people who made a donation in response to the current mailing, consider predicting the amount of a donation (named "Donation_D1" in the worksheet) from the median years of school completed by adults in the neighborhood ("School_D1") and the number of promotions received before this mailing ("Promotions_D1").
a. Find the regression equation and the coefficient of determination.
b. Is there a significant relationship overall?
c. Which, if any, of the explanatory variables has a significant t test? What does this tell you?