GoodBelly: Using Statistics to justify the marketing expense. Perform a regression analysis using excel add-in stat tools. Multiple regression and backward regression.

The data came from 126 Whole Food stores over the 10 weeks between May 4 and July 13. There was a total of 1,386 observations. At the senior manager meeting in July of 2010, GoodBelly management expressed concerns about the promotional budget and asked the marketing manager to justify the demo and endcap activities. Unless the marketing department could convince management of the programs' efficacy, the department would be hit for budget reduction. Asses the GoodBelly sales spreadsheet and identify, if any, the impact of the in-store demos and endcap promotions. Recommendations are to be firmly backed with statistical data.

I have done the spread sheet but do not know how to interpret the data