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1) A manufacturer of headphones is interested in the sales of a particular headphone model in its stores in 8 airports.
To get full points when answering each part below be sure to: calculate an appropriate statistic, state the result of the test, and state your conclusion.
a) Looking at all the stores, is there a difference in sales between January and March? [6 points]
b) Did the campaign have a different effect on sales for stores on the East coast versus on the West coast? [6 points]
c) Was there a difference in sales in January for stores on the East coast versus on the West coast? [6 points]