# Regression Equation and Standard Error

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The 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 KILOWATT

ROOMS HOURS

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 6 room house

c. Determine the standard error of estimate.

d. Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding kilowatt-hours would occur between what two values?

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The 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.

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