The research department of the company in Problem 2 investigated the change in sales for each of die company's salespeople. Using criteria supplied by management, the department categorized all territory sales changes as "increased substantially," "increased marginally," or "no increase." Consider the following table, in which 260 sales personnel have been classified as old or new.

a. Does this table provide evidence of consistent variation? Justify your answer.
b. What conclusions can be drawn about the relationship between X and Y on the basis of the table?

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Territory Sales Change Increased Marginally Increase Salesperson Assigned New Old Increased No 30 40 Total 110 150 75 50 60