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Week 3 Simple Regression Forecasting Sales Problem Homework Assignment Using the Excel file Forecasting Sales Using Ad Dollar
Decision Analysis Forecasting Assignment Using Linear Regression Ad $ in Thousands Sales $ in Millions Predicted Sales Error
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Answer #1

increasing ad will increase the sales

SUMMARY OUTPUT
Regression Statistics
Multiple R 0.84795
R Square 0.719019
Adjusted R Square 0.683897
Standard Error 67.19447
Observations 10
ANOVA
df SS MS F Significance F
Regression 1 92431.72 92431.72 20.4717 0.001938
Residual 8 36120.78 4515.097
Total 9 128552.5
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%
Intercept 828.1269 136.1286 6.083416 0.000295 514.2138 1142.04
ad 10.78676 2.384042 4.524567 0.001938 5.289146 16.28437

Y =828.1269 +10.7868*ad

...................

ad sales Predicted sales error
41 1250 1270.384 -20.3839
54 1380 1410.612 -30.6118
63 1425 1507.693 -82.6926
54 1425 1410.612 14.38822
48 1450 1345.891 104.1088
46 1300 1324.318 -24.3177
62 1400 1496.906 -96.9058
61 1510 1486.119 23.88092
64 1575 1518.479 56.52064
71 1650 1593.987 56.01334

.................

Please let me know in case of any doubt.

Thanks in advance!


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