Psychology 2810 Study Guide - Midterm Guide: Central Limit Theorem, Statistical Inference, Standard Deviation

• School: Western University
• Department: Psychology
• Course: Psychology 2810
• Professor: Sandra Hessels

Document Summary

Assume that the dependent variable is a scaled measure (interval or ratio data) The distribution of the population of interest must be approximately normal. Statistical tests are based on the idea that there is not perfect experiment. The goal of inferential statistics is to determine the level of uncertainty. The situation has an iq of 95. = the percent of people smarter than him. The z test is a way of determining if the sample mean is different from the population mean. The null hypothesis- sample does not differ from the general populatin. The alternate hypothesis- the sample does differ from the mean. As the sample gets bigger, the sample mean is less likely to be different by chance. As the sample size gets bigger, the variance and the sample size gets smaller. How closely sample means closer around the population mean. Calculated by taking the standard deviation of the population mean, over the square root of the sample size.