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Notes 3 - Describing Distributions with Numbers Submitted...

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Describing Distributions with Numbers Submitted by gfj100 on Fri, 10/30/2009 - 09:01 Location The word location is used as a synonym for the “middle” or “center” of a dataset. There are two common ways to describe this feature. 1. The mean is the usual numerical average, calculated as the sum of the data values divided by the number of values. It is nearly universal to represent the mean of a sample with the symbol , read as “x-bar.” 2. The median of a sample is the middle data value for an odd number of observations, after the sample has been ordered from smallest to largest. It is the average of the middle two values, in an ordered sample, for an even number of observations. So far we have mentioned center in a vague manner. Spread is inadequately described by range which only provides information based on the minimum and maximum values of a set of data. With center and spread being the two most important features of a data distribution they should be carefully defined. One measure of center is the

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Notes 3 - Describing Distributions with Numbers Submitted...

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