Confidence interval for the expected value

Reference no: EM1320883

You have been provided with the following regression output. The dependent variable is unit sales of a product, and the independent variable is the dollar value of newspaper advertising for that product. The unit of analysis is weeks; that is, each of the observations in the underlying sample data represents a separate week of sales and newspaper advertising.

Regression Analysis: Sales versus Newspaper

The regression equation is:

Sales = 6514 + 0.0386 Newspaper

Predictors	Co-eff	SECo-eff	T	P
Constant	6514	1138	5.72	0.000
Newspaper	0.038625	0.005494	7.03	0.00

S = 5630.70 R-Sq = 24.3% R-Sq(adj) = 23.8%

Analysis of Variance

Source	D F	S S	M S	F	P
Regression	1	1567134272	1567134272	49.43	0.000
Residual Error	154	4882532724	31704758
Total	155	6449666996

1. How much will sales increase if Newspaper spending increases by 1?, 1000?

2. How much variability will you have if you predict sales with this model?

3. What would be your best point estimate for average Sales in weeks for which Newspaper advertising were $1 million? What would be an appropriate interval estimate for this? (Use 95% limits.)

Reference no: EM1320883

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