## Question

###### An experiment was performed t0 compare the fracture toughness of high purity 18 Ni maraging steel with commercial-purity stell of the same type: For m = 32 specimens; the sampe average toughness was X == 65.6 for the high-purity steel, whereas for n = 38 specimans of commerical steel the average toughness was Y = 59.8 Because high-purity steel is more expensive; its use for certain application can be justifed if its fracture thoughness exceeds that of commercial-purity steel by more than 5.Assum

An experiment was performed t0 compare the fracture toughness of high purity 18 Ni maraging steel with commercial-purity stell of the same type: For m = 32 specimens; the sampe average toughness was X == 65.6 for the high-purity steel, whereas for n = 38 specimans of commerical steel the average toughness was Y = 59.8 Because high-purity steel is more expensive; its use for certain application can be justifed if its fracture thoughness exceeds that of commercial-purity steel by more than 5. Assume that O = 1.2 and Oy = 1.1 test the relevant hypothesis using alpha = 0.001 Compute 8 for the test conducted in Problem when /1 Hz = 6

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