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Median If n is an even number (Formula)
(n/2 + (n/2)+1)/2

Median If n is an odd number (Formula)
(n+1)/2

If the data are skewed, the ___________ is a good measure of central tendency.
Median

Population Variance (Formula)


Empirical Rule Values
68% 95% 99.7%

Population Mean (Formula)
Where xi is the midpoint, xifiis the frequency of the ith class, n is the number of classes.

Population zscore (Formula)
z= xu/sigma

Sample zscore (formula)
z=xxbar/s

Determining the kth percentile, Pk
Where k is the percentile of the data value and n is the number of individuals in the data setIf i is an integer, the kth percentile is the ith data value. If i is not an integer, find the mean of the observations on either side of i.

Lower (first) quartile, Q1
(k=25)

Upper (third) quartile, Q3
(k=75)

Interquartile range: IQR (formula)
Q3Q1

Lower inner fence Formula
Q1 (1.5 × IQR)

upper inner fence Formula
Q3 +(1.5 × IQR)

