The two most crucial factors that influence the strength of solders used in cementing computer chips into the mother board of the guidance system of an airplane are identified as the machine used to insert the solder and the operator of the machine. Four solder machines and three operators were randomly selected from the many machines and operators available at the company’s plants. Each operator made two solders on each of the four machines. The resulting strength determinations of the solders are given here.
a. Write a model for this study. Include all the terms and conditions placed on the terms in the model.
b. Present the AOV table for this study, and include the expected mean squares.
c. What conclusions can you draw about the effect of machine and operator on the variability in solder strength?
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