3. (30 points) A local retailer hired you to explore the relationship between th

Question

3. (30 points) A local retailer hired you to explore the relationship between the sales and the number of TV commercials putted on the market. You also noticed that since most people watch TV during the night, you consider to bring another dummy variable inside the model. When this dummy variable equals to 0, the commercial is broad- casted during the night only: when the dummy variable equals to 1, the commercial is broadcasted during daytime only Regression Stotistics Multiple R 0.742017 R Square Adjusted R Squ: 0531466 Standard Error 12.42755 Observations 055059 S0 ANOVA SS MSF gnificance Regression Residual Total 8893.128 4446.564 28.79077 6.87E-09 7258.872 154.4441 Coefficients ndard Ern t Stat P-value Lower 95%Upper95%wer9509pper 95.0% 22.25893 7.736532 2.877121 0.006018 6.69504 37.82283 6.69504 37.82283 Intercept Night/Day 3.4446 3.519269 0.97878 0332699 -10.5245 3.63526 -10.5245 3.63526 Commercials 7.670398 1.016006 7.549557 1.215 09 5.626457 9.714339 5.626457 9.714339 (a) (5 points) What is the degrees of freedom for Residual and Regression, respectively?

Explanation / Answer

a)

degree of freedom of regression = k = 2

degree of freedom of residual = n-k-1 = 50 - 2-1 = 47

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