Two samples of Hypothesis Test

timer Asked: Jan 29th, 2015

Question description

Two types of engine bearings were fabricated out of different compounds and tested in an

experimental engine to measure how long it takes until they fail. The 35 Type I bearings

lasted an average of 1.574 million engine cycles with an estimated standard deviation of 0.34

million cycles. In the other group, 40 Type II bearings lasted an average of 1.796 million

engine cycles with an estimated standard deviation 0.57 million cycles. Assuming that these

times are independent and normally distributed, test whether there is a significant difference

between the average breakdown times. Use a significance level of α = 0.05.

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