Test the null hypothesis of independence of the two classifications A and B of the 3 × 3 contingency table shown here. Use α = .05.
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| B |
|
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| B1 | B2 | B3 |
| A1 | 40 | 72 | 42 |
A | A2 | 63 | 53 | 70 |
| A3 | 31 | 38 | 30 |
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