Question: Elastotech, a plastics company, is trying to determine whether four successive daily batches of their Lexan polycarbonate have the same mean hardness value. Four daily

Elastotech, a plastics company, is trying to determine whether four successive daily batches of their Lexan polycarbonate have the same mean hardness value. Four daily samples of polycarbonate were taken, and the resulting hardness values were measured (using the Rockwell R scale). The following Excel output was obtained.

a. At the 1% significance level, can we conclude that the mean hardness differs among the four daily batches?
b. If significant differences exist, use Tukey's HSD method at the 1% significance level to determine which batches have different mean hardness values.

Day 1 R 115.752 108.003 121.39119.53 Day 2 Day 3 Day 4

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