PSY 1101 Lecture Notes - Lecture 4: Explained Variation, Null Hypothesis, Sample Size Determination

• School: University of Ottawa
• Department: Psychology
• Course: PSY 1101
• Professor: Kenneth Campbell

Document Summary

A difference not occurred by chance alone. Changing the individual difference( ex if you give more beer it will affect them more) The reasearcher must indicate what is the possibility of finding a difference this large by chance alone. Example: the level of significance is set at . 05. Null hypothesis: violent video will have no affect on childrens behavior. Freud: will cause a decreace in childrens aggression. Social modeling: will cause an increase in childrens aggression. Size of sample: 3 people from each people. 2 groups: 85% vs 72% in highschool left side vs right side. Sampling 3 people is not the same as sampling 50 people for 10 years. One or few exceptional cases are studied in detail. Problems-generalization (hm had an abnormal brain to begin. Exceptions: some people turn up every day but still die at 90. Randomly sample a small number of individuals from a.