Aroofing company would like to implement a new method for giving estimates. the owner has narrowed his choice to three different methods. since estimator variability is believed to be a significant factor in the overall cost estimate, each of the company's three job estimators is asked to give a cost estimate for a new roof using each of the three methods. the data will be analyzed using a randomized block design. what are the blocks in this study? a. the roofing company b. the estimators c. the estimate method d. the cost for a new roof