PSYC 1010 Chapter Notes - Chapter 4: Squared Deviations From The Mean, Descriptive Statistics, Central Tendency
21 Oct 2013
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How to read histograms and frequency polygons. X means you need to sum all the x-values. Central tendency is a statistical measure that identifies a point as representative of the entire distribution. Central tendency helps to determine the typical single score for a distribution or set of scores. What is typical for a large population: eg. To find the centre or most typical score even when the distribution i skewed or the data is messy, there are three methods for determining central tendency. You must always remember that the goal of any method of central tendency is to find the most typical score. Mean the sum of all the scores, divided by the number of scores (arithmetic average). Median the middle score the value that divides the distribution in half when the observations are ordered in terms of size. Notation is a key issue in statistics. Sometimes there"s more than one symbol for the same thing.
