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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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