In a health study the dietary habits of 420000 men were, Ask an Expert

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In a health study, the dietary habits of 420,000 men were examined over a 3-year period. For those who ate no fried foods, the death rate was 1208 per 100,000 man-years. For men who consumed fried foods more than 15 times a week, the corresponding rate was only 702.

Considering that the relative ages of members of these two groups were not mentioned, critique the internal validity of the experiment.

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Category:- Statistics and Probability
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