PSY 250 Lecture Notes - Lecture 42: Statistical Hypothesis Testing, Alternative Hypothesis, Null Hypothesis
Document Summary
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. ***when we take a sample, we have to make sure that it is not too small to that it is representative of the population. 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 (std dev) Smaller sample, the more likely the sample mean will differ from the population mean (n = sample size) Identify the probability of getting results if there really wasn"t a difference between groups. Make prediction(s) to a population based on sample data. Statistics that make inferences about a population based on sample data.
