PSYCH 2220 Chapter Notes - Chapter 4: Standard Deviation, Quartile, Squared Deviations From The Mean
8 Feb 2018
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Document Summary
Central tendency refers to the descriptive statistic that best represents the center of a data set, the particular value that all the other data seem to be gathering around. Mean - the arithmetic average of a group of scores. It is calculated by summing all the scores in a data set and then dividing by the total # of scores. Perfectly balances 2 sides of the distribution. Statistic - a # based on a sample taken from a pop; usually symbolized by latin letters. Parameter - a # based on the whole pop; usually symbolized by greek letters. Median - the middle score of all the scores in a sample when the scores are arranged in ascending order. If there is no single middle score, the median is the mean of the 2 middle scores. If there"s a lot of data points, divide the number of scores by 2, then add 0. 5.
