2. The sales area manager wishes to determine the effectiveness of promotional campaign for a beauty product. She conducted an audit of sales of the product in ten shops one month before and one month after the campaign. The following data on average monthly sales (in thousand pesos) were obtained. Could we say that the campaign is effective in boosting the sales? State the research problem and hypothesis. Test your hypothesis at a = .05. Shops A B C D E F G H I Before 75 85 60 40 57 69 71 80 49 90 Campaign After 80 90 70 50 60 75 80 90 55 100 Campaign