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 options could be confounding variables. Parents' socio-economic status might influence both the ability to afford an all-organic diet and other factors affecting alertness. School start times could affect alertness independently of diet. The quality of the non-organic diet could also impact alertness, making it difficult to attribute differences solely to the organic diet.

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