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A survey is conducted to investigate the relationship between exposure of a mysterious chemical A and specific chronic disease B. The results of the survey

A survey is conducted to investigate the relationship between exposure of a mysterious chemical A and specific chronic disease B. The results of the survey are shown as the following contingency table based on exposure status (those with and without chemical A exposure) and disease status (disease B or not).

Disease B No diabetes Total
chemical A exposure 125 75 200
No chemical A exposure 50 150 200
Total 175 225 400

A. Please test whether there is an association between chemical A exposure and disease B.

PLEASE SHOW THE CALCULATIONS FROM THE TABLE

B. Please calculate the odds ratio of having disease B comparing to no disease group under the chemical A exposure and its 95% confidence interval

PLEASE SHOW THE CALCULATIONS FROM THE TABLE

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