21. Bidding on Construction Jobs A building contractor wants to compare the bids of three construction engineers, A, B, and C, to determine whether one tends to be a more conservative

(or liberal) estimator than the others. The contractor selects four projected construction jobs and has each estimator independently estimate the cost (in dollars per square meter) of each job. The data are shown in the table:

Analyze the experiment using the appropriate methods.
Identify the blocks and treatments, and investigate any possible differences in treatment means. If any differences exist, use an appropriate method to specifically identify where the differences lie. Has blocking been effective in this experiment? What are the practical implications of the experiment? Present your results in the form of a report.

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Construction Job Estimator 1 2 3 4 Total A 35.10 34.50 29.25 31.60 130.45 B 37.45 34.60 33.10 34.40 139.55 C 36.30 35.10 32.45 32.90 136.75 Total 108.85 104.20 94.80 98.90 406.75