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Confidence levels for Bradford Electric Illuminating Company

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The Bradford Electric Illuminating Company is studying the relationship between kilowatthours (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-Hours Number of Kilowatt-Hours
Rooms(thousands) Rooms(thousands)
12 9 8 6
9 7 10 8
14 10 10 10
6 5 5 4
10 8 7 7
a. Determine the .95 confidence interval, in thousands of kilowatt-hours, for the mean of all six-room homes.
b. Determine the .95 prediction interval, in thousands of kilowatt-hours, for a particular sixroom home.

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Calculating the confidence levels for a random sample of homes.

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