Acompany in maryland has developed a device that can be attached to car engines, which it believes will increase the miles per gallon that cars will get. the owners are interested in estimating the difference between mean mpg for cars using the device versus those that are not using the device. the following data represent the mpg for random independent samples of cars from each population. the variances are assumed equal and the populations normally distributed. with device without device 22.6 26.9 23.4 24.4 28.4 20.8 29.0 20.8 29.3 20.2 20.0 26.0 28.1 25.6 given this data, what is the upper limit for a 95 percent confidence interval estimate for the difference in mean mpg?
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