Elastotech, a plastics company, is trying to determine whether four successive daily batches of their Lexan polycarbonate
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 samples of polycarbonate were taken, and the resulting hardness values were measured (using the Rockwell R scale). The following Excel output was obtained.
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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.
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a H 0 Day1 Day2 Day3 Day4 H A Not all population means are equal At 001F df 1 df 2 F 001367 409 Sinc...View the full answer
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Related Book For 
Business Statistics Communicating With Numbers
ISBN: 9780078020551
2nd Edition
Authors: Sanjiv Jaggia, Alison Kelly
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