Psychology 1000 Chapter Notes - Chapter Appendix: Standard Deviation, Frequency Distribution, Central Tendency

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Mike Atkinson

Document Summary

Summarize & describe characteristics of a set of scores. Shows the number of participants who received a score. Researchers can use intervals in relation to frequencies. Describes distribution in terms of a single statistic that is in some way. 3 commonly used measures of central tendency: mean, median, mode . Provides info about the spread of scores in a distribution. Average of squared deviation scores about mean. Square root of variance - describes variance in same units as original data. Symmetrical bell-shaped curve that represents theoretical distribution of scores of a. Many variables of population is distributed in a way that approximates a normal curve. Can be used to divide normal curve into areas w/ known percentages of population. About of population fall within +/-1 sd of the mean. About 95% of the population falls within +/-2 sd of mean. Nearly all cases fall within +/-3 sd of mean.