Question: Two different types of tips can be used in a Rockwell hardness tester. Eight coupons from test ingots of a nickel based alloy are selected,

Two different types of tips 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 twice, once with each tip. The Rockwell C-scale hardness readings are shown in the following table. Use the sign test with a = 0.05 to determine whether or not the two tips produce equivalent hardnessreadings. Tip 1 Coupon Tip 2 63 60 2 52 51 58 56

Tip 1 Coupon Tip 2 63 60 2 52 51 58 56 59 4 60 5 55 58 57 54 53 52 61 59 6.

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