A researcher is interested in the effects of a preschool program on later school performance. Because she is concerned that socio-economic status (SES) is a potential extraneous variable in her study, she picks children to study who are only from low SES homes. The control technique she used in this study was:
A) Matching
B) Random assignment
C) Holding the extraneous variable constant
D) Statistically controlling the extraneous variable

Question

Quizplus · Accepted Answer

The researcher controlled the extraneous variable by selecting participants only from low SES homes, thus holding the SES constant across the study.

A Researcher Is Interested in the Effects of a Preschool