Psychology 2800E Lecture Notes - Lecture 18: Prosocial Behavior, Statistical Conclusion Validity, Type I And Type Ii Errors

• School: Western University
• Department: Psychology
• Course: Psychology 2800E
• Professor: Doug Hazelwood

Document Summary

Prologue + a brief review: the three basic features of experiments, at least one variable is manipulated called the independent variable (iv) Iv is also called factors (single factor experiment, multiple factor called factorial experiment) Levels are called treatments or conditions : at least one variable is measured called the dependent variable (dv) All other extraneous ( or third ) variables are controlled. Can say that any change in the measured variable (dv) was caused by changes in the manipulated variable (iv). B. two types of experimental designs (actually three, third is combined of those) Different groups exposed to different levels of iv ( eg experimental group and control group, with random assignment to groups) All participants are exposed to all level of the iv( no random assignment needed, but control is still important see feb 25 lecture: four types of validity in experiments ( and threats to each type)