In an air pollution study, a random sample of 200 households was selected from each of 2 communities. A respondent in each house was asked whether or not anyone in the house was bothered by air pollution. The responses are tabulated below:
Community Yes No Total
I 43 157 200
II 81 119 200
Total 124 276 400
Can the researchers conclude that the 2 communities are bothered differently by
air pollution? (a = 0.05)
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