The tapedata.xlsx fi le contains data for weeks during 2009-2011 for the unit sales of 3M tape, price charged, whether an ad campaign was run that week (1 = ad campaign), and whether the product was displayed on the end of the aisle (1 = end cap). Use this fi le to perform the following exercises:
a. Does there appear to be an upward trend in sales?
b. Analyze the nature of the monthly seasonality of tape sales.
c. Does an ad campaign appear to increase sales?
d. Does placing the tape in an end-cap display appear to increase sales?