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Statistics formula sheet

Terms in this set (16)

Z score (Standard Score)
X= data value
μ = mean
σ = standard deviation
Box and whisker plot
1. minimum data entry
2. Q1
3. Q2
4. Q3
5. maximum data entry
Outlier
Q1-(IQR X 1.5)

Q3+ (IQR X 1.5)
Interquartile range?
IQR= Q3-Q1
Sample variance
s²
Calculator: Sx²
Sample Standard deviation
s
Calculator: Sx
Population standard deviation
N= # of frequency input
x= data
μ= mean
Population variance
N= # of frequency input
x= data
μ= mean
Distribution Shape
uniform (rectangular)
Symmetrical (bell shape)
skew left (negative skew)
skew right (positive skew)
mean of frequency distribution
x = midpoint
f= frequency of class
n= total # of frequencies

sigma= addition
Weighted mean
Ew = total number frequency
Population mean
μ
Sample mean
x̅
Relative frequency
Frequency/ total entries

(histogram)
bars must touch
Frequency polygon
use midpoint
Cumulative frequency (OGIVE)
The sums of the frequencies of the data values from smallest to largest.

(use class width to determine the value before the lower class limit on graph)
(midpoint)
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