Psychology 2800E Chapter Notes - Chapter 11: Spontaneous Remission, Measuring Instrument, Confounding

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Glen Gorman

Document Summary

One-group, pretest/posttest design: a researchers recruits one group of participants, measures them on a pretest, exposes them to a treatment, intervention, or change, and then measures them on a posttest. This is also known as the spontaneous remission. Subjects may just improve on their own (they mature): history threats: sometimes a threat to internal validity occurs not just because time has passed, but because something specific has happened between the pretest and posttest. This is when a performance is extreme at time 1, the next time that performance is measured (time 2), it is likely to be less extreme. Meaning it is closer to a typical or average performance. If you perform really abnormally well, then the next time you do that activity you probably won"t be as good and you"ll do just as good as you normally would (the mean).