Consider the following statement, "In a nationwide study, children on an all-organic diet are more alert in school than those not on an all-organic diet." Which of the following is a plausible confounding variable in this study?
A) Parents' social-economic status
B) School start times
C) The quality of the non-organic diet
D) All of these
E) None of these

Question

Quizplus · Accepted Answer

All of these factors could influence the study's outcome, as they can affect children's alertness independently of their diet.

Consider the Following Statement, "In a Nationwide Study, Children on an All-Organic