12.24 Refer to Exercise 12.13. Casting 1 is a standard, and castings 2, 3, and 4 involve slight modifications to the process. Compare the standard with each of the modified processes by producing three confidence intervals with simultaneous confidence coefficient approximately 0.90.

not matter which of the three estimators is assigned to a particular job. To check the consistency of the estimators, several jobs are selected and all three estimators are asked to make estimates.
The estimates for each job (in thousands of dollars) by each estimator are given below.

a Do these estimates provide sufficient evidence that the means for the estimators differ? Use = 0.05.
b Present the complete ANOVA summary table for this experiment.

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Estimator Job A B C 1 27.3 26.5 28.2 23 66.7 67.3 65.9 3 104.8 102.1 100.8 4 87.6 85.6 86.5 5 54.5 55.6 55.9 6 58.7 59.2 60.1