n an effort to determine the cost of air conditioning, a resident in College Station, TX, recorded daily values of the variables Tavg = mean temperature Kwh = electricity consumption for the period...

n an effort to determine the cost of air conditioning, a resident in College Station, TX, recorded daily values of the variables

Tavg = mean temperature

Kwh = electricity consumption for the period from September 19 through November 4 (Table 7.19).

(a) Make a scatterplot to show the relationship of power consumption and temperature.

(b) Using the model

Kwh = β₀
+ β₁
(Tavg) + ε;

estimate the parameters, test appropriate hypotheses, and write a short paragraph stating your findings.

(c) Make a residual plot to see whether the model appears to be appropriately specified.