Energy efficiency: A sample of 10 households was monitored for one year. The household income (in $1000s) and the amount of energy consumed (in 1010 joules) were determined. The results follow.

a. Compute the least-squares regression line for predicting energy consumption from income.

b. Construct a residual plot. Verify that a linear model is appropriate.

c. If two families differ in income by $12,000, by how much would you predict their energy consumptions to differ?

d. Predict the energy consumption for a family whose income is $50,000.

Transcribed Image Text:

Income 31 40 Energy 16 40 22 28 48 195 96 70 100 145 78 30 46 185 98 94 77 115 67