KINE 2049 Chapter Notes - Chapter 5: Random Assignment, Confounding, Statistical Process Control

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

Document Summary

Methods to minimize error variance include using: care and precision when gathering data, samples that are representative of the population, appropriate and careful measurement procedures for dependent variable, careful and proper data analysis techniques. Researchers balance internal and external validity since they tend to be inversely related. E. g. you can have very high internal validity but low external validity or vise versa. If the internal validity is too weak, overall value of the findings is questionable. Factors such as, loss of subjects during course of experiment, uncontrolled events that occur during the experiment, etc. Threats to internal validity generally affect either subjects and their behaviour or treatment during the experiment & threats related to experimental procedures or instrumentation. Pretesting (practice effects: u(cid:271)je(cid:272)ts (cid:373)ay (cid:862)lear(cid:374)(cid:863) ho(cid:449) to take the post-test therefore this experience causes the subsequent improvement, not the treatment, e. g.