Suppose that the relationship between two variables x and y can be described by the regression line y = 2.0 + 0.5x.
a. What is the change in y for a one-unit change in x?
b. Do the values of y increase or decrease as x increases?
c. At what point does the line cross the y-axis? What is the name given to this value?
d. If x = 2.5, use the least squares equation to predict the value of y. What value would you predict if x = 4.0?