KINE 2049 Chapter Notes - Chapter 9: Internal Validity, Random Assignment, Treatment And Control Groups

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 2049
• Professor: Merv Mosher

Document Summary

Interaction effect: when differences in one factor depends upon the level of a second factor: practice effect: participants perform better in later condition due to practice, fatigue effect: perform worse later due to fatigued or bored. Quasi-experimental: require treatment manipulation, requires random assignment, require treatment manipulation, does not require random assignment. Experimental research is the gold standard in research designs: one ore more independent variables are manipulated by the researcher (treatments). Treatment manipulation: treatment: unique feature of experimental research that sets is apart form other research methods, treatment manipulation helps control the "cause and effect: relationship, must be checked using pre-tests and post-tests. History threat: possibility that the observed effects (dependent variables) are caused by external/historical events, e. g. : student stress levels may be higher due to school, and not the drug being tested. Maturation threat: possibility that the observed effects are cause by maturation of subjects, e. g. general improvement in understanding.