Cascade Pharmaceuticals Company developed the following regression model, using time-series data from the past 33 quarters, for one of its nonprescription cold remedies: Durbin-Watson (d) statistic =...

Cascade Pharmaceuticals Company developed the following regression model,

using time-series data from the past 33 quarters, for one of its nonprescription

cold remedies:

Durbin-Watson (d) statistic = 0.4995

a. Which of the independent variables (if any) appears to be statistically significant (at the 0.05 level) in explaining sales of the cold remedy?

b. What proportion of the total variation in sales is explained by the regression

equation?

c. Perform an F-test (at the 0.05 level) of the overall explanatory power of the

model.

d. What additional statistical information (if any) would you find useful in the

evaluation of this model?