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(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. An SFlS of 12 stores this year shows mean sales of 64 units of a small appliance, with a standard deviation of 5.8 units. During the same point in time last year, an SRS of 19 stores had mean sales of 58.374 units, with standard deviation 16.3 units. An increase from 58.374 to 64 is a rise of about 9%. 1. Construct a 95% confidence interval estimate of the difference #1 #2; where #1 is the mean of this year's sales and M is the mean of last year's sales. (a)