A company 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. 
Given this data, what is the upper limit for a 95 percent confidence interval estimate for the difference in mean mpg?
Definitions:
Exchange Rate
The worth of one currency when converted into another, indicating the amount of one currency that can be swapped for another.
Net Capital Outflow
The difference between the purchase of foreign assets by domestic residents and the purchase of domestic assets by foreigners in a given period.
Foreign-Currency Exchange
The process of converting one currency into another currency, facilitating international trade and investment.
Exchange Rate
The exchange rate is the value of one currency for the purpose of conversion to another. It expresses how much of one currency is needed to buy a unit of another currency.
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