Question: completely stuck with finding the formulas for Excel. 18. The managers of Mayo Department Store want to evaluate the relationship between the sales of air

completely stuck with finding the formulas for Excel.

18. The managers of Mayo Department Store want to evaluate the relationship between the sales of air conditioners and the average weekly temperature. The following weekly sales data along with the average daytime temperatures for 10 one-week periods are shown in the following table: Week 1 2 3 & 5 8 2 9 10 100 85 103 110 70 115 150 120 97 85 Air Conditioner Sales (in units) Average Temperature in degrees Fahrenheiro 78 70 85 90 75 96 101 98 8680 1. Develop a linear regression equation for air conditioner sales as a function of the average weekly temperature. 2. Forecast air conditioner sales if the average weekly temperature is 88 degrees Fahrenheit. 3. Evaluate the "goodness of fit" of the regression equation by computing the values of R2, 1, and syx and interpret the results

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