Unformatted text preview: 3-2 Measures of Variation Symbols for Variance The Range Is the highest value minus the
lowest value. - The Deviation of an entry x in a population
data set is the difference between the data
entry and the mean of the data set. - The Variance is the average of the squares
of the deviations. - The Standard Deviation ls a measurement that gives you a better idea of how the data
values differ from the mean. it is the square root of the variance. ﬁll-I‘lﬂ'lh - The symbol for sample variance is s2 - The symbol for population variance is
02 “Fl—ll Symbois for Standard
Deviation - symbol forsample standard deviation Is 5 - symbol for population standard deviation is o ;.
‘3-3H’ Example A We - Tenueedtraiibikesarerandomlyselecledmndtheodorneter
reading oteadtlsrecorded asfollows. s = \/ variance ::2 2:: 2: 222 2: Set up a chart as shown on the next slide. ...
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- Summer '08