14.31 Wealth and Education Levels Does education really make a difference in how much money you will earn? Researchers randomly selected 100 people from each of three income categories "marginally rich," "comfortably rich," and "super rich" and then recorded their educational attainment, as in the table.

a. Describe the multinomial experiments whose pro- portions are being compared in this experiment.

b. Do these data indicate that the level of wealth is affected by educational attainment? Test at the 1% level of significance.

c. Based on the results of part

b, describe the practical nature of the relationship between level of wealth and educational attainment.

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No college/university Marginally Comfortably Super Rich Rich Rich ($70-99 K) ($100-249 K) ($250 K or more) 32 222 Some college/university 13 College/university degree Postgraduate study/degree 25 8-8 20 23 16 1 43 51 60 12 112 13 16