The flashcards below were created by user
Timmit
on FreezingBlue Flashcards.
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Median If n is an even number (Formula)
(n/2 + (n/2)+1)/2
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Median If n is an odd number (Formula)
(n+1)/2
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If the data are skewed, the ___________ is a good measure of central tendency.
Median
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Population Variance (Formula)
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Empirical Rule Values
68% 95% 99.7%
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Population Mean (Formula)
 Where xi is the midpoint, xifiis the frequency of the ith class, n is the number of classes.
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Population z-score (Formula)
z= x-u/sigma
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Sample z-score (formula)
z=x-xbar/s
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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.
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Lower (first) quartile, Q1
(k=25)
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Upper (third) quartile, Q3
(k=75)
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Inter-quartile range: IQR (formula)
Q3-Q1
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Lower inner fence Formula
Q1 -(1.5 × IQR)
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upper inner fence Formula
Q3 +(1.5 × IQR)
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