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# Regression Analysis: SSR, F-Value, Partial F-Test, VIF, and CI

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1. What is SSR(X1 and X2)?
a) 2028032.69
b) 632259.45
c) 1395773.24

2. What is the F-value for X1 when used the partial F test criterion for determining the contribution of X1?
a) 55.28
b) 32.12
c) 43.81

3. What is the F-value for X2 when used the partial F test criterion for determining the contribution of X2?
a) 55.28
b) 32.12
c) 43.81

4. Determine which explanatory variable has a significant relationship with sales (Y) using the 5% significance level.
b) Newspaper only

5. Set up a 95% confidence interval estimate of the population slope between sales and radio/TV ads.
a) (9.399, 16.763)
b) (10.593, 22.998)
c) (6.320, 18.005)

6. Set up a 95% confidence interval estimate for the average sales that have 10 radio/TV ads and 20 newspaper ads.
a) (464.393, 781.893)
b) (254.608, 991.678)
c) (158.750, 464.393)

7. Compute the VIF (Variance Inflationary Factor) for Newspaper Ads.
a) 0.008464
b) 0.991536
c) 1.008560

8. Using the result of Question 7, is there reason to suspect the existence of collinearity?
a) Yes, there is reason to suspect the existence of collinearity.
b) No, there is no reason to suspect the existence of collinearity.
c) There is not enough information to determine such a situation.