Problem: The population of interest for a research study is adolescents in the United States aged 13-15. The researcher recruits 50 participants from a local junior high and high school and sets up a laboratory experiment to examine the influence of peers on learning tasks. The researcher takes care only to manipulate the independent variable and hold all other variables constant. In this example, the researcher has minimized: Need Assignment Help?
- both external validity and population validity
- internal validity to maximize population validity
- population validity to maximize external validity
- population validity to maximize internal validity