02Frequency Tables - FREQUENCY TABLES A parameter is a...

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F REQUENCY T ABLES A parameter is a numerical characteristic of a population. A statistic is a numerical characteristic of a sample. A statistic is a single value that summarizes some characteristic of interest. There are many statistics that can be of interest. Some of these statistics are measures of central tendency such as the mean , median , and mode of a set of data. The mode of a set of data is the most commonly occurring value in a series. If we are looking at classes, it is the class that contains the most entries (has highest frequency). It is possible to have one mode, more than one mode (bimodal, trimodal), or no mode at all. The mode is not the most useful of the measures of central tendency and is typically only used when others are not available. The mode will always be a value in the data series. The arithmetic mean of a set of data is usually what people mean when they say average. The mean is the sum of all the data values divided by the number of data values.
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This note was uploaded on 07/12/2011 for the course MATH 241 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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02Frequency Tables - FREQUENCY TABLES A parameter is a...

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