Statistics Vocabulary 3.2
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degrees of freedom
a number used in some calculations, n-1 (where n is the number of data values in the set)
variance of a variable
a numerical measure of how the individual data values relate to the mean of the data set. a large value means the data is widely spread, whereas a small value means the data is tightly clustered around the mean.
empirical rule
a relation between standard deviation and the corresponding area under the standard bell curve
range of a data set
the difference between the largest data value and the smallest data values.
standard deviation
the square root of the variance; the standard deviation is used more commonly in statistics than the variance