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8-14 Statistics aplet
When the data set contains an odd number of values, the
data set’s median value is not used when calculating Q1
and Q3 in the table above. For example, for the following
data set:
{3,5,7,8,15,16,17}
only the first three items, 3, 5, and 7 are used to calculate
Q1, and only the last three terms, 15, 16, and 17 are
used to calculate Q3.
Two-variable
MEANΣ Mean value of data set.
PVARΣ Population variance of data set.
SVARΣ Sample variance of data set.
PSDEV Population standard deviation of
data set.
SSDEV Sample standard deviation of data
set.
MINΣ Minimum data value in data set.
Q1 First quartile: median of values to
left of median.
MEDIAN Median value of data set.
Q3 Third quartile: median of values to
right of median.
MAXΣ Maximum data value in data set.
Statistic Definition (Continued)
Statistic Definition
MEANX Mean of x- (independent) values.
ΣX Sum of x-values.
ΣX2 Sum of x
2
-values.
MEANY Mean of y- (dependent) values.
ΣY Sum of y-values.