a) State the hypothesis. b) Set the level of significance. c) Write the critical values or region of rejection. d) Test the statistics. Show the summary of the computations from the ExCel (cut and paste the table). e) Make a decision and write the conclusion.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