A sociologist investigated predictors of amount of money families spend on food. He discovered that the most important predictors were annual income and number of people in the family. The regression...

A sociologist investigated predictors of amount of money families spend on food. He discovered that the most important predictors were annual income and number of people in the family. The regression equation was:

Food amount = 500 + 0.023*(Annual income) + 252*(No. of persons)

a) How much does amount spent on food increase per family member?

b) If a family earned R1 000 more per year, by how much would the amount spent on food increase?

c) What would a five-person family with an annual income of R100 000 spend on food?