Refer to Exercise 11.52.
a. Predict the average gas consumption for both groups of homes when the temperature difference is 20° F.
b. Place 95% confidence intervals on your predicted values in part (a).
c. Based on the two confidence intervals, do you believe that the average gas consumption has been reduced by using the new form of insulation?
d. Predict the gas consumption of a home insulated with the new type of insulation if the temperature difference was 50° F.
In exercise
Data for Homes with Standard Form of Insulation:

Data for Homes with New Form of Insulation:

TempDiff F) 20.3 20.7 20.9 22.8 23.1 248 25.9 26.1 270 27.2 GasConsumptin kWh) 70.3 70.7 72.9 77.6 79.3 86.5 90.6 919 945 92.7 298 302 306 318 332 33.4 34.2 35.1 362 36.5 GasConsumption (kWh) 104.8 1032 912 896 116.2 1169 105.1 106.1 1178 120.3 TempDiff GasConsumption (kWh) 65.3 665 67.8 73.2 75.3 811 822 85.7 909 874 TempDiff OF) GasConsumption (kWh) 94.9 93.9 87.1 84.2 106.6 1113 100.9 1019 1101 119.1 20.1 211 219 22.6 23.4 24.2 24.9 251 26.0 27.2 28.8 29.2 30.6 308 32.6 324 348 35.9 36.0 36.5