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

Number of Rooms KW Hours (thousands)

’12 9

‘9 7

’14 10

‘6 5

’10 8

‘8 6

’10 8

’10 10

‘5 4

‘7 7

Find the value of ‘r’ and interpret your answer