Confounding creates problems with researchers’ ability to ______ the study. It is a problem of not being able to ______. What phrases best fill in the

Confounding creates problems with researchers’ ability to ______ the study. It is a problem of not being able to ______. What phrases best fill in the two blanks above? A. 1st blank: conduct 2nd blank: include the chosen subjects B. 1st blank: conduct 2nd blank: satisfy ethical requirements C. 1st blank: draw conclusions from 2nd blank: find a subject in the control group to compare to each subject in the treatment group D. 1st blank: draw conclusions from 2nd blank: tell the difference between multiple effects

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