8. What kind of confound is random assignment designed to control? Give the text

Question

8. What kind of confound is random assignment designed to control? Give the textbook definition of this confound. Finally, consider a study that finds Americans who drink 1-2 glasses of wine, per day, tend to live longer / healthier lives. By using random assignment to do this study, to compare two groups (wine drinkers vs. wine non-drinkers), what key confounds would you be controlling for? What individual differences may co-vary with the IV? What individual differences may be strongly related to the DV (longevity)?

Explanation / Answer

Random assignment is designed to control the confounding due to selctive approach to response either due to interveier or responder.

By doing random assignment to compare two groups wine drinkers vs. wine non-drinkers we are restricting the deliberate confoudnign to people to to drinker group when they are used to drink. so the confoudning effect of habit of drinking is overcome by ranodm assignment

IV is group and the individual difference of drinking habit may co-vary with the IV.

Indivudal difference of health consciuosness may be strongly related to the DV (longevity).

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