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No information(numbers) was given. The question is just asking in general. How/ why might not measuring...

No information(numbers) was given. The question is just asking in general.

How/ why might not measuring cholesterol levels of the participants of the two groups, experimental and control, prior to start the study introduce a confounding variable?

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Confounding variable may effect the experimental design in the above scenario if not introduced/identified earlier in the experimental study.Prior to the start of the study, confounding variable has no effect on the experiment .It is only once the experimental study has started that the confounding variables if not identified earlier can change the effect of a dependent and independent variable.Also in above case, measuring cholesterol level is a dependent variable that is affected by an independent variable(not mentioned ).An independent variable has an effect on the dependent variable but confounding variables if introduced in the experimental study can also have an effect on the dependent variable.

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