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Multiple Regression for Vanguard Corp

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The director of a marketing at Vanguard Corp believes that sales of the company's bright side laundry detergent (s) are related to Vanguard's own advertising expenditure (a), as well as the combined advertising expenditures of its three biggest rival detergents (r).
The marketing director collects 36 weekly observations on S, A, and R to estimate the following multiple regression equation:
S= a + bA + cR
where S, A and R are measured in dollars per week, Vanguard;s marketing director is comfortable using parameter estimates that are statistically significant at the 10 percent level or better.

a). what sign does the marketing director expect a, b and c to have?
b). interpret the coefficients a, b and c.
The regression output from the computer is as follows:

Dependent Variable : S R Squared F Ratio P Value on F
Observations 36 0.2247 4,781 0.0150

Variable Parameter Estimate Standard Error T Ratio P Value

Interception 175086.0 63821.0 2.74 0.0098
A 0.8550 0.3250 2.63 0.0128
R -0.284 0.164 - 1.73 0.0927

c). Does vanguard's advertising expenditure have a statistically significant effect on the sales of bright side detergent? explain using the appropriate p value.
d). what fraction of the total variation in sales of bright side remains unexplained? what can the marketing director do to increase the explanatory power of the sales equation? what other explanatory variables might be added to this equation?
e). what is he expected level of sales each week when vanguard spends $40,000 per week and the combined advertising expenditures for the three rivals are $100,000 per week?

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