# PSYB01H3 Chapter Notes - Chapter 13: Statistical Inference, Factorial Experiment, Observational Error

## Document Summary

Inferential statistics are used to determine whether we can, in fact, make statements that the results reflect what would happen if we were to conduct the experiment again and again with multiple samples. The null hypothesis is simply that the population means are equal the observed difference is due to random error. The research hypothesis is that the population means are, in fact not equal. Difference: the null hypothesis states that the independent variable had no effect, the research hypothesis states that the indepedent variable did have an effect. Statistical significance a significant result is one that has a very low probability of occuring if the population means are equal. Probability is the likelihood of the occurence of some event or outcome. Esp (extrasensort perception ability) in the case of probability: a card that is presented with different symbols. In your experiment, lets say you have 10 trails each of the five cards is presented two in randomn order.