A confounding variable is powerful if it is likely to A) Have ...

[burchfield96]

A confounding variable is powerful if it is likely to
 
  A) Have a minimal effect on the dependent measure.
  B) Have a large effect on the independent variable.
  C) Correlate minimally with the dependent measure.
  D) Have a large effect on the dependent measure.

Question 2

Using more than one control group in differential research studies is often necessary
 
  A) To prevent confounding other variables with the independent measure.
  B) To make sure there are enough participants.
  C) To prevent confounding other variables with the dependent measure.
  D) Because it is the current trend in psychological research.

[irishcancer18]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: A