What are the assumptions of Pearson’s correlation? Bradford Electric Illuminating is studying the relationship between kilowatt-hours (thousands) used and the number of rooms in private single-family residences. A random sample of 5 houses yields the following.

Number of rooms	11	10	14	7	9
Kilowatts-hours(thousands) used	9	8	11	5	9

1. Find the correlation coefficient between the number of rooms and kilowatts-hours used. Interpret the result.
2. Determine the regression equation of kilowatts hours used on the number of rooms. Interpret the value of the regression coefficient.
3. Estimate the kilowatts-hours used for an 8 rooms house.