2} 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 1week period is recorded. Then, without changing their price, she places a large ad in the newspaper, adyertising the 15 items. She records the quantity sold for a 1week period. The results are as follow: \" Using (1 = 0.052 my, what can you conclude