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A company has recorded data on the weekly sales for its product (y), the unit price of the competitor's product (x1), and advertising expenditures (x2). The data resulting from a random sample of 7 weeks follows. Use SPSS or Excel's Regression Tool to answer the following questions.
Week
Price
Advertising
Sales
1
.33
5
20
2
.25
14
3
.44
7
22
4
.40
9
21
.35
16
6
.39
8
19
.29
15
a. What is the estimated regression equation?
b. Determine if price is significantly related to sales. Use a = 0.10.
c. Determine if advertising is significantly related to sales. Use a = 0.10.
d. Find and interpret the multiple coefficient of determination, R2.
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