Construct a95%

95%confidence interval estimate of the difference?

(1 point) A market research firm supplies manufacturers with estimates of the retail sales of their products from samples of retail stores. Marketing managers are prone to look at the estimate and ignore sampling error. A simple random sample of 22 stores this year shows mean sales of 59 units of a small appliance, with a standard deviation of 12.6 units. During the same point in time last year, a simple random sample of 18 stores had mean sales of 44.762 units, with standard deviation 10.9 units. An increase from 44762 to 59 is a rise of about 24%. Construct a 95% confidence interval estimate of the difference \"I \"2, where ,ul is the mean of this year's sales and M is the mean of last year's sales.