A psychologist studying perceived “quality of life” in a large number of cities 1N 5 1502 came up with the following equation using mean temperature (Temp), median income in

$1,000 (Income), per capita expenditure on social services (SocSer), and population density (Popul) as predictors.

Y ˆ
5 5.37 2 0.01Temp 1 0.05Income 1 0.003SocSer 2 0.01Popul

(a) Interpret the above regression equation in terms of the coefficients.

(b) Assume a city has a mean temperature of 55 degrees, a median income of $12,000, spends $500 per capita on social services, and has a population density of 200 people per block. What is its predicted Quality of Life score?

(c) What would we predict in a different city that is identical in every way except that it spends $100 per capita on social services?