4.36. Suppose that in Problem 4.23 the engineer suspects that the workplaces used by the four operators may represent an additional source of variation. A fourth factor, workplace

((, ", 5, *) may be introduced and another experiment conducted, yielding the Graeco-Latin square that follows.

Analyze the data from this experiment (use ( $ 0.05) and draw conclusions.

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Order of Assembly 1 2 Operator 3 4 1234 1 CB 11 By 10 == D8 = 14 Aa = 8 Ba = 8 C8 C8 12 Ay = 10 DB = 12 4 Ao = 9 Dy 9 Da =11 BB=1 Cy = 15 AB 8 Ca: = Ca 18 B6 = 6