### Confidence interval for the expected value

Assignment Help Basic Statistics
##### 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.)