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A study of 1000 men over 65 indicated that 250 smoked and 50 of these smokers had some signs of heart disease, while 100 of

A study of 1000 men over 65 indicated that 250 smoked and 50 of these smokers had some signs of heart disease, while 100 of the nonsmokers showed some signs of heart disease. Let S be the event "smokes" and H be the event "has signs of heart disease." Are these two events independent?

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