Which of the following is true of selection effects?
A) They are a type of confound.
B) They can occur when experimenters allow participants to choose their own treatment group.
C) They can occur when researchers assign one type of person to one treatment group and another type of person to another treatment group.
D) All of the above are true of selection effects.
E) None of the above are true of selection effects.

Question

Quizplus · Accepted Answer

Selection effects are a type of confound that can occur due to the selection of participants for different treatment groups. This can happen when experimenters allow participants to choose their own treatment group (option B) or when researchers assign certain types of people to one group and another type to another group (option C). Therefore, option D, "All of the above are true of selection effects," is the correct answer.

Which of the Following Is True of Selection Effects