Individual differences should not be confounding variables i

Individual differences should not be confounding variables if we use __________ as a method of determining groups.

Between subjects design

Within-subjects design

Random assignment

b or c

a or c

Solution

answer is (c)

that is

Individual differences should not be confounding variables if we use random assignment as a method of determining groups.

in random assignment means that each participants has an equal chance of being assigend to any group in an experiment.

since A confounding variable (also called a third variable) is a variable that DOES cause a problem because it is empirically related to both the independent and dependent variable. A confounding variable is a type of extraneous variable (it’s the type that we know is a problem, rather than the type that might potentially be a problem).