Question: A supermarket chain is interested in exploring the relationship between the sales of its store-band canned vegetables (y), the amount spent on promotion of the

A supermarket chain is interested in exploring the relationship between the sales of its store-band canned vegetables (y), the amount spent on promotion of the vegetables in local newspapers (x1) and the amount of shelf space allocated to the brand (x2). One of the chain's supermarkets was randomly selected, and over a 20 week period, x1 and x2 were varied, as reported in the data below.

Present the regression model for the dependent variable and calculate the projection for the next period.

WeekSalesAdExpShelfSpc

1201020175

2185020550

3240035575

4157520830

5355059075

6201539750

7390882075

8187040030

9487799775

10219051530

11500599675

122500 62550

13300586050

143480101250

155500113575

16199563530

17239083730

184390120050

19278599030

202989120530

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