PSY 250 Lecture Notes - Lecture 10: Random Assignment, Null Hypothesis, Statistical Inference
Document Summary
Error variance variability among scores not caused by the iv. Estimate the probability that observed differences are true (not caused by error variance) by using inferential statistics. Every sample will have a different mean. Distribution of the means of every possible sample taken from a population. The frequency distribution of the sample means tends to be a normal distribution. Sample means are more likely to be close to the population mean than to be far away from it. The difference between a sample mean and the population mean. Estimate of the amount of variability in the sample means. More variability in the scores, more variability in the means from different samples. Smaller sample, the more likely the sample mean will differ from the population mean (n~ sample size) We say that the groups were not significantly different not that they"re the same. A result that"s significant at p01 isnt more significant than one at p
