1. Explain in your own words what a blocking variable is.
2. Consider Problem 11.12. Provide three examples of blocking variables that can be used for that particular experiment.

Data from problem 11.12

That the starting salaries of new accounting graduates would differ according to geographic regions of Canada seems logical. A random selection of accounting firms is taken from three provinces, and each is asked to state the starting salary for a new accounting graduate who is going to work in auditing. The data obtained follow. Use a one way ANOVA to analyze these data. Note that the data can be restated to make the computations more reasonable (example: $42,500 = 4.25). Use a 1% level of significance.