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Does advertising by its three largest rivals affect sales of Bright Side detergent in a statistically significant way? Explain, using the appropriate p-value. 5- What fraction of the total variation in sales of Bright Side remains unexplained? What can the marketing director do to increase the explanatory power of the sales equation? What other explanatory variables might be added to this equation? 6- What is the expected level of sales each week when Vanguard spends $40,000 per week and the combined advertising expenditures for the three rivals are $100,000 per week?

Does advertising by its three largest rivals affect sales of Bright Side detergent in a statistically significant way? Explain, using the appropriate p-value. 5- What fraction of the total variation in sales of Bright Side remains unexplained? What can the marketing director do to increase the explanatory power of the sales equation? What other explanatory variables might be added to this equation? 6- What is the expected level of sales each week when Vanguard spends $40,000 per week and the combined advertising expenditures for the three rivals are $100,000 per week?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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4- Does advertising by its three largest rivals affect sales of Bright Side detergent in a statistically significant way? Explain, using the appropriate p-value.

5- What fraction of the total variation in sales of Bright Side remains unexplained? What can the marketing director do to increase the explanatory power of the sales equation? What other explanatory variables might be added to this equation?

6- What is the expected level of sales each week when Vanguard spends $40,000 per week and the combined advertising expenditures for the three rivals are $100,000 per week?

 

a. What sign does the marketing director expect a, b, and c to have? b. Interpret the coefficients a, b, and c. The regression output from the computer is as follows: DEPENDENT VARIABLE: S VARIABLE INTERCEPT A R OBSERVATIONS: 36 0.2247 PARAMETER ESTIMATE 175086.0 0.8550 R-SQUARE -0.284 STANDARD ERROR 63821.0 0.3250 0.164 F-RATIO 4.781 T-RATIO 2.74 2.63 +1.73 P-VALUE ON F 0.0150 P-VALUE 0.0098 0.0128 0.0927 c. Does Vanguard's advertising expenditure have a statistically significant effect on the sales of Bright Side detergent? Explain, using the appropriate p-value. d. Does advertising by its three largest rivals affect sales of Bright Side detergent in a statistically significant way? Explain, using the appropriate p-value. e. What fraction of the total variation in sales of Bright Side remains unexplained? What can the marketing director do to increase the explanatory power of the sales equation? What other explanatory variables might be added to this equation? f. What is the expected level of sales each week when Vanguard spends $40,000 per week and the combined advertising expenditures for the three rivals are $100,000 per week?
Transcribed Image Text:a. What sign does the marketing director expect a, b, and c to have? b. Interpret the coefficients a, b, and c. The regression output from the computer is as follows: DEPENDENT VARIABLE: S VARIABLE INTERCEPT A R OBSERVATIONS: 36 0.2247 PARAMETER ESTIMATE 175086.0 0.8550 R-SQUARE -0.284 STANDARD ERROR 63821.0 0.3250 0.164 F-RATIO 4.781 T-RATIO 2.74 2.63 +1.73 P-VALUE ON F 0.0150 P-VALUE 0.0098 0.0128 0.0927 c. Does Vanguard's advertising expenditure have a statistically significant effect on the sales of Bright Side detergent? Explain, using the appropriate p-value. d. Does advertising by its three largest rivals affect sales of Bright Side detergent in a statistically significant way? Explain, using the appropriate p-value. e. What fraction of the total variation in sales of Bright Side remains unexplained? What can the marketing director do to increase the explanatory power of the sales equation? What other explanatory variables might be added to this equation? f. What is the expected level of sales each week when Vanguard spends $40,000 per week and the combined advertising expenditures for the three rivals are $100,000 per week?
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