13.18 Slopes, correlations, and units In Example 2 on y = house selling price, x1 = house size, and x2 = number of bedrooms, yn = 60,102 + 63.0x1 +

15,170x2, and R = 0.72.

a. Interpret the value of the multiple correlation.

b. Suppose house selling prices are changed from dollars to thousands of dollars. Explain why if each price in Table 13.1 is divided by 1000, the prediction equation changes to yn = 60.102 + 0.063x1 + 15.170x2.

c. In part

b, does the multiple correlation change to 0.00072? Justify your answer.