The U.S. Energy Information Administration releases figures in their publication, Monthly Energy Review, about the cost of various fuels and electricity. Shown here are the figures for four different items over a 12-year period. Use the data and stepwise regression to predict the cost of residential electricity from the cost of residential natural gas, residual fuel oil, and leaded regular gasoline.

Examine the data and discuss theoutput.

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Residential Electricity (kWh) Leaded Regular Gasoline (gal) Residential Natural Gas (1000 ft3) 1.29 1.71 2.98 3.68 4.29 5.17 6.06 Residual Fuel Oil (gal) .21 2.54 3.51 4.64 5.36 6.20 6.86 7.18 7.54 7.79 7.41 7.41 7.49 .57 86 1.19 1.31 1.22 1.16 1.13 1.12 86 61 76 68 65 69 5.83 5.54 4.49 34 42 .33