A psychologist is interested looking at the effectiveness of a new computer program in helping students learn math. She decides to test this new program with a group of middle school students. At this particular school, the boys and girls tend to be disruptive when they are in the same classroom, so she decides to run them in separate groups in the
Experiment. She creates a group of boys, each of them using the computer program four times per week. She creates a group of girls to serve as a comparison group and they do not get the computer program. This experimental design is flawed because gender is a
Confounding variable and as a result the following has been lowered:

Question

Quizplus · Accepted Answer

The design is flawed because gender is a confounding variable, which affects the internal validity of the experiment. Internal validity refers to the extent to which the results of an experiment can be attributed to the treatments used in the study rather than other factors.

A Psychologist Is Interested Looking at the Effectiveness of a New