Explain why you cannot perform the chi-square independence test on these data.

Use the information below. 

The frequencies in a contingency table can be written as relative frequencies by dividing each frequency by the sample size. The contingency table below shows the number of U.S. adults (in millions) ages 25 and over by employment status and educational attainment.

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Educational attainment Associate's, bachelor's, or advanced Not a high school graduate 10.0 High school graduate no degree 33.5 2.1 Some college, Status Employed Unemployed Not in the labor force degree 67.1 1.9 21.7 1.1 0.9 26.4 13.2 24.6 12.6