A manufacturing company is interested in buying one of twodifferent kinds of machines. The company tested the two machinesfor production purposes. The first machine was run for 8 hours andit produced an average of 126 items per hour with a standarddeviation of 9 items. The second machine was run for 10 hours andit produced an average of 117 items per hour with a standarddeviation of 6 items. Assume that the production per hour for eachmachine is approximately normally distributed.
a. Construct a 90% confidence interval forthe difference between the two machines.
b. Interpret the results
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