PSY 200 Lecture Notes - Lecture 4: Standard Deviation, Statistical Parameter
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Measure of the difference between scores and how spread out or clustered the. Chapter 4: variability scores are in a distribution. Variability shows how a score represents the distribution. Three measures: range, variance, and standard deviation. Distance between the smallest and largest score in a distribution. If we are using an anxiety scale which ranges from 7 to 70, and we assume at least one pa(cid:364)ticipant sco(cid:364)es a 7 and one sco(cid:364)es a 70, ou(cid:364) (cid:364)ange is . Based on only two scores, not all of the data. Arguably the most important/common measure of variability. Standard deviation is a measure of the average distance from the mean. Describes how close/distant the scores are clustered around the mean. Chapter 4: variability // 14 sept. 2018 // page 1. Variance is the measure of the average distance from the mean. Similar concept to standard deviation, but not identical. Sd is the square root of the variance, and variance is sd squared.
