ENTR 3P99 Chapter Notes - Chapter 7: Skewness, Upper And Lower Bounds, Kurtosis
16 Feb 2012
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Document Summary
We use descriptive statistics in two ways: they provide a description of our sample by summarizing and organizing our data. They often involve calculating as well as producing graphical displays of (inter alia) Measures of the central tendency of the data. Measures of central tendency are also referred to as averages. The purpose of a measure of central tendency is to provide a single value which summarizes a variable. There are three commonly used measures of central tendency. Middle value when scores are placed in rank order. Sum of all scores divided by the number of scores, i. e. arithmetical average. The mode (or modal class) can be calculated for minimal, ordinal, interval, or ratio scale data. e. g. 2, 2, 2, 3, 4, 5, 1000. With a variable measured on interval or ratio scales, there may be no two values which are identical.
