A new type of tip can be used in a Rockwell hardness
Chapter 9, Problem 128E(choose chapter or problem)
Problem 128E
A new type of tip can be used in a Rockwell hardness tester. Eight coupons from test ingots of a nickel based alloy are selected, and each coupon is tested using the new tip. The Rockwell C-scale hardness readings are 63, 65, 58, 60, 55, 57, 53, and 59. Do the results support the claim that the mean hardness exceeds 60 at a 0.05 level?
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