$1.$ Build a statistical model to explain the relationship between sales and promotional efforts and interpret the regression output.

$2.$ Does the in$-$store demo program boost sales? If so$,$ for how long does the sales lift last?

$3.$ Does the placement of the product within the store affect sales?

$4.$ What other factors affect sales of BoodBelly's products? Based on the regression output, what are your recommendations to GoodBelly's management?

$5.$ Are there any suggestions to improve and refine the model?