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Mathematics, 27.02.2020 03:14 anthonylemus36

An owner of a home in the Midwest installed solar panels to reduce heating costs. After installing the solar panels, he measured the amount of natural gas used yy ( in cubic feet) to heat the home and outside temperature xx (in degree-days, where a day's degree-days are the number of degrees its average temperature falls below 65 oFoF) over a 23-month period. He then computed the least-squares regression line for predicting y from x and found it to be: yˆ=y^=89 + 19x. How much, on average, does gas used increase for each additional degree-day?

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