From Exercise 1, we also have data on how long each person has been with the company (tenure) categorized into three levels: less than one year, between one and five years, and more than five years. A table of the two variables together looks like this:

a) Find the marginal distribution of the tenure. (Hint: Find the row totals.)

b) Verify that the marginal distribution of the education level is the same as that given in Exercise 1.

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None AA BA MA Ph.D. <1 year 10 3 50 20 12 1-5 years 42 9 112 27 15 More than 112 30 63 5 2 5 years