Question: 4.7. Consider the hardness testing experiment described in Section 4.1. Suppose that the experiment was conducted as described and that the following Rockwell C-scale data

4.7. Consider the hardness testing experiment described in Section 4.1. Suppose that the experiment was conducted as described and that the following Rockwell C-scale data

(coded by subtracting 40 units) obtained:

Coupon Tip 1 2 3 4 1 9.3 9.4 9.6 10.0 234

(a) Analyze the data from this experiment.

(b) Use the Fisher LSD method to make comparisons among the four tips to determine specifically which tips differ in mean hardness readings.

(c) Analyze the residuals from this experiment.

Coupon Tip 1 2 3 4 1 9.3 9.4 9.6 10.0 234 9.4 9.3 9.8 9.9 9.2 9.4 9.5 9.7 9.7 9.6 10.0 10.2

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