PSY 1101 Lecture Notes - Lecture 11: Blind Experiment, Explained Variation, Null Hypothesis

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

Document Summary

Statistical significance: divide explained variance by unexplained variance. If this ratio is large enough, the difference is said to be statistically significant. The researcher must indicate what the probability of finding a difference this large by chance alone. Example: the level of significance is set at 0. 05. (95 times out of 100 it will be the same but 5/100 we would find differences this large just by chance only 5 times. Null hypothesis: violent video will have no affect on children"s aggression. Psychoanalytic/ freud hypothesis: violent video will cause a decrease in children"s aggression. Wrong our findings say that they become more aggressive. Social modelling hypothesis: violent video will cause an increase in children"s aggression (not absolutely certain but 99% confident) Correct positive evidence to support this. Larger differences are more likely to be significant. We are much more confident with results from large samples than small samples.