Question: Repeat the analyses in Problem 11.64 controlling for weight differences between the heavier- and the lighter smoking twins? One of the issues in relating bone

Repeat the analyses in Problem 11.64 controlling for weight differences between the heavier- and the lighter smoking twins?

One of the issues in relating bone density to smoking is that smokers and nonsmokers differ in many other characteristics that may be related to bone density; these differences are referred to as confounders.

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