A study was made by a retail merchant to determine the relation between weekly advertising expenditu
Question: A study was made by a retail merchant to determine the relation between weekly advertising expenditures and sales. The following data was recorded:
| advertising costs( $) | sales($) |
| 40 | 385 |
| 20 | 400 |
| 25 | 395 |
| 20 | 365 |
| 30 | 475 |
| 50 | 440 |
| 40 | 490 |
| 20 | 420 |
| 50 | 560 |
| 40 | 525 |
| 25 | 480 |
| 50 | 510 |
? Plot a scatter diagram
? Find the equation of the regression line to predict weekly sales from advertising expenditures
? Estimate the weekly sales when advertising costs are $35.
? Plot the residuals vs. advertising costs. Comment
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Deliverables: Word Document
Deliverables: Word Document
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