Referring to Table 12-6, what is the 90% confidence interval for the expected change in average heating costs as a result of a 1 degree Fahrenheit change in the daily minimum outside temperature using Model 1?
a. [-6.58, -3.65]
b. [-6.24, -2.78]
c. [-5.94, -3.08]
d. [-2.37, 15.12]

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SUMMARY OUTPUT of House Size (in 100s of square feet) Regression Statistics Multiple R R Square Adjusted R Square Standard Error 0.865 0.748 0.726 5.195 Observations 50 ANOVA MS Signif F 0.0001 Regression 3605.7736 901.4434 Residual 1214.2264 26.9828 Total 49 4820.0000 t Stat - 0.281 3.9545 Cocff - 1.6335 0.4485 P-value 0.7798 StdEror 5.8078 0.1137 Intercept Income 0.0003 Eamily Size School 4.2615 0.8062 5.286 0.0001 - 0.6517 – 1.509 0.4319 0.1383