Question: Consider the Rockwell hardness test data in Exercise 15-9. Assume that both distributions are continuous and use the Wilcox on signed-rank test to test that

Consider the Rockwell hardness test data in Exercise 15-9. Assume that both distributions are continuous and use the Wilcox on signed-rank test to test that the mean difference in hardness readings between the two tips is zero. Use a = 0.05.

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