Statistics Flashcards
1
Q
Arithmetic Mean
A
Σxifi/Σfi
2
Q
Assumed Mean
A
Σfidi/Σfi + a
3
Q
Step Deviation Mean
A
(Σfiui/Σfi*h) + a
4
Q
Combined Mean
A
(n1x1 + n2x2)/n1+n2
5
Q
Median
A
l + (N/2-F) * h /f, where l = lower limit
N = Total number of observation
F = cumulative frequency of the preceding class
f = frequency of the median class
h = class interval
6
Q
Mode
A
l + (fo-f1/2fo-f1-f2)*h, where l = lower limit
fo= Frequency of modal class
f1 = Frequency of preceeding class
f2 = Frequency of suceeding class
h = class Interval of modal class
7
Q
Range
A
Highest value - Lowest Value
8
Q
Variance
A
Σxi^2/n -(Σxi/n)^2
9
Q
Mean Square Deviation(s^2)
A
Σ(xi-a)^2/n
