In Design and Analysis of Experiments, 5th edition (John Wiley & Sons, 2001), D. C
Chapter 13, Problem 13-26(choose chapter or problem)
In Design and Analysis of Experiments, 5th edition (John Wiley & Sons, 2001), D. C. Montgomery describes an experiment that determined the effect of four different types of tips in a hardness tester on the observed hardness of a metal alloy. Four specimens of the alloy were obtained, and each tip was tested once on each specimen, producing the following data: (a) Is there any difference in hardness measurements between the tips?
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