Psychology 2810 Lecture Notes - Lecture 2: Descriptive Statistics, Unimodality, Central Tendency

• School: Western University
• Department: Psychology
• Course: Psychology 2810
• Professor: Livia Velseka

Document Summary

Measures of central tendency a measure of central tendency represents the centre or middle of a dataset types of central tendency: mean (grand mean), median, mode. Grand mean mean of two or more sample means we weight each sample mean but its sample size. 6, 4, and 8 are the sample sizes of each of the 3 companies alternatively you can find the mean of all of the raw scores (add up every raw score and divide by total sample size) Measures of variation a measure of variation represents the dispersion of scores around a typical value. 4 measures of variation: range variance standard deviation coefficient of variation. We can conclude study 2 has the greater dispersion of scores researchers typically report mean and standard deviation because if you want to know the coefficient of variation, you can find it easily.