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Breaking Strength of Wool Serge Material

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The quality control director for a clothing manufacturer wants to study the effect of machines on the breaking strength (in pounds) of wool serge material. A batch of the material is cut into square-yard pieces, and these are randomly assigned, 12 each, to the three machines chosen specifically for the experiment. The results are on file Breakstw (attached).

At the 0.05 level of significance,
A. Is there an effect due to machine?
B. Plot the mean breaking strength for each machine?
C. If appropriate, use the Tukey-Kramer procedure to examine differences among machines.
D. What can you conclude about the effects of machines on breaking strength? Explain.

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A. To figure out if there is difference between these three machines, we perform "single factor ANOVA analysis" under "data analysis" in excel. Based on the output above, ...

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