A regression has been performed on two continuous centered predictors x and z. It is known that n = 116, sd(x) = 1.73, and sd(z) = 2.01. The estimated regression line is
Yi = 28.63 + 7.15xi + 2.82zi − 1.12xizi
Compute the simple slope for the regression of Y on x when z is one standard deviation
below mean.
a. 1.5
b. 4.9
c. 9.4
d. 38.0
