Use PsycINFO or a similar database to find a quasi-experimental or nonexperimental research study. (Note: Try using a specific term such as nonequivalent control group or cross-sectional as a search...

Use PsycINFO or a similar database to find a quasi-experimental or nonexperimental research study. (Note: Try using a specific term such as nonequivalent control group or cross-sectional as a search term. Or look for a topic that involves comparing different populations of participants. For example, using gender differences as a search term should lead you to studies comparing males and females.) Once you have located an article, answer each of the following questions.

Identify one factor in the study that prevents it from being a true experiment. That is, why are the researchers unable to say that changes in one variable are unquestionably responsible for changes in another variable?