An electrical engineer wishes to compare the mean lifetimes of

An electrical engineer wishes to compare the mean lifetimes of two types of transistors in an application involving high-temperature performance. Asample of 60 transistors of type A were tested and were found to have a mean lifetime of 1827 hours and a standard deviation of 168 hours. A sample of 180 transistors of type B were tested and were found to have a mean lifetime of 1658 hours and a standard deviation of 225 hours. Find a 95% confidence interval for the difference between the mean lifetimes of the two types of transistors.

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