the difference between the maximum data value and the minimum data value.

standard deviation ("s")

is a measure of variation of values about the mean.

a measure of variation equal to the square of the standard deviation.

are measures of location, denoted P1, P2... P99, which divide a set into 100 groups

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Study Guide P&S

Term	Definition
Range	the difference between the maximum data value and the minimum data value.
standard deviation ("s")	is a measure of variation of values about the mean.
variance	a measure of variation equal to the square of the standard deviation.
s2	sample variance
	population standard deviation
	population variance
range rule of thumb	68% 95% 99.7%
Chebyshev's Therom	75% 89%
Percentiles	are measures of location, denoted P1, P2... P99, which divide a set into 100 groups
ordinary values
unusual values