Bradford Electric Illuminating Company is studying the relationship between kilowatt-hours (thousands) used and the number of rooms in a private single-family residence. A random sample of 10 homes yielded the following:

Number of rooms Kilowatt-Hours (000)

12 9

9 7

14 10

6 5

10 8

8 6

10 8

10 10

5 4

7 7

a. Determine the regression equation. b. Determine the number of kilowatt-hours, in thousands, for a six-room house. c. Determine the standard error of estimate and the coefficient of determination. d. Interpret the coefficient of determination