Question 9: What other variable might have an influence on this relationship?
Is there any variable which might be related both to BMI and to alcohol consumption? One obvious contender is sex. Men have a different body shape to women and might well have a different average BMI. Also, men are more likely to drink large amounts of alcohol regularly than are women.
If the average alcohol consumption of men were greater than that of women and men had a larger average BMI, this might produce a relationship between BMI and alcohol consumption.
We shall investigate this possibility next week.
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