The computer output for the multiple regression analysis for Exercise provides this information:
a. Which, if any, of the independent variables x1, x2, and x3 contribute information for the prediction of y?
b. Give the least-squares prediction equation.
c. On the same sheet of graph paper, graph y versus x1 when x2 = 1 and x3 = 0 and when x2 = 1 and x3 = .5. What relationship do the two lines have to each other?
d. What is the practical interpretation of the parameter β1?
Exercise:
Suppose that you fit the model
E(y) = β0 + β1x1 + β2x2 + β3x3
to 15 data points and found F equal to 57.44.
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