GoodBelly Case 1. Run a regression to determine the relationship between sales and promotional efforts, controlling for other variables that may affect sales ("controlling" just means you include these other variables in your regression). 2. Interpret the regression output both in technical terms and non-technical terms ("Non-technical" means when somebody not trained in statistics looks at your interpretation, they should be able to understand what you are trying to say.) 3. Prepare a 1-page report to convince (or yield to) Goodbelly management. Your report should NOT contain any statistical terms (like "p-value", etc.). Your report should contain the following though: a. Does in-store demo program help in increasing sales? Can you quantify this? Is the increase in sales just temporary? b. How about endcap competition? Quantify its effect. c. Based on your regression output (and other analysis, if any), what else can you conclude? What is your recommendation to the management