Question: A plant manager would like to show that the yield of a woven fabric in the plant does not depend on machine operator or time

A plant manager would like to show that the yield of a woven fabric in the plant does not depend on machine operator or time of day and is consistently high. Four randomly selected operators and 3 randomly selected hours of the day are chosen for the study. The yield is measured in yards produced per minute. Samples are taken on 3 randomly chosen days.

(a) Write the appropriate model.

(b) Evaluate the variance components for operator and time.

(c) Draw conclusions.

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