L33 Psych 300 Chapter 4: Central Tendency and Variability
31 Jan 2019
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Document Summary
Central tendency - the descriptive statistic that best represents the center of the data set, the particular value that all the other data seems to be gathering around. Mean in plain english - the arithmetic average of a group of scores (often just called the average), a precise number that should be the typical score in a distribution. Mean in plain arithmetic - calculated by summing all the scores in a data set and dividing this sum by the total number of scores. Mean expressed by symbolic notation - m or x-bar (x with a bar above) The numbers based on s amples taken from a population are called s tatistics; m is a statistic. The numbers based on whole p opulations are called p arameters, u is a parameter. How to calculate the mean: add up all the scores and divide by the # of scores.
