Question: please help and show all work please! Heart attacks 4.1.6 Studies conducted in New York City and Boston have noticed that more heart attacks occur

please help and show all work please!

Heart attacks 4.1.6 Studies conducted in New York City and Boston have noticed that more heart attacks occur in December and January than in all other months. Some people have tried to conclude that holiday stress and overindulgence cause the increased risk of heart attack. Identify a confounding variable whose effect on heart attack rate might be confounded with that of the month, providing an alternative explanation for the increased risk of heart attack in December and January. Also, include a diagram showing how this explanation works

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