Chapter 10, Problem 111SE

a.

To determine

Explain the assumptions necessary to test the claim that each tip produces the same Rockwell C-scale hardness readings.

Check the assumptions.

b.

To determine

Check whether the data support the claim that the difference in Rockwell C-scale hardness readings of the two tips differ significantly from zero or not by using an appropriate statistical method.

c.

To determine

Find the coupons that should be used in the test.