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In the following table, individuals are cross-classified by their age group and income level. Income Age Low Medium High 21-35 120 100 75 36-50 150

In the following table, individuals are cross-classified by their age group and income level.

Income

Age Low Medium High

21-35 120 100 75

36-50 150 160 100

51-65 160 180 160

For the chi-square test of independence, the degrees of freedom are __________.

A. 8

B. 9

C. 2

D. 4

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