18 An owner of a home in the Midwest installed solar panels

18. 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 y (in cubic feet) to heat the home and outside temperature x (in degree-days, where a day\'s degree-days are the number of degrees its average temperature falls below 65° F) over a 23-month period. He then computed the least-squares regression line for predicting y from x and found it to be

How much, on average, does gas used increase for each additional degree-day?
______ cubic ft

Solution

It is the slope constant 17 cubic feet will be increased for each additional degree-day.