Overview
The manager of the cosmetics section of a large department store wants to determine whether newspaper advertising really does affect sales. For her experiment, she randomly selects 15 items currently in stock and proceeds to establish a baseline. The 15 items are priced at their usual competitive values, and the quantity of each item sold for a 1-week period is recorded. Then, without changing their price, she places a large ad in the newspaper, advertising the 15 items. Again, she records the quantity sold for a 1-week period. The results are as follows. Using
? = .05 2 tailed testItemNo. Sold Before adNo. sold After ad125322182433744240516196202472322832349606410404211272712710131311142332151627
What is the independent and the dependent variable?
What is the alternative hypothesis? (Use a nondirectional hypothesis)
What is the null hypothesis?
What are the critical regions?
What is the test result? (Possible bonus points when you complete the test)