An experiment was performed to compare the fracturetoughness of high-purity 18 Ni

Chapter 9, Problem 10

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An experiment was performed to compare the fracturetoughness of high-purity 18 Ni maraging steel with commercial-purity steel of the same type (Corrosion Science,1971: 723736). For specimens, the sample averagetoughness was for the high-purity steel,whereas for specimens of commercial steel. Because the high-purity steel is more expensive,its use for a certain application can be justified only if itsfracture toughness exceeds that of commercial-purity steelby more than 5. Suppose that both toughness distributionsare normal.a. Assuming that and , test the relevanthypotheses using .b. Compute b for the test conducted in part (a) when.

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