# Statistic Formulas

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• Created by: Simone
• Created on: 22-06-13 17:09
Formula for finding an angle in a pie chart?
Angle = number in category / total number X 360
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Frequency?
Frequency = Class Width X Frequency Density
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Position of Median
(n + 1) / 2
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Q1
(n + 1) / 4
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D1
(n + 1) / 10
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P1
(n + 1) / 100
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Outliers in Box Plots (lower)
values > Q3 + 1.5(Q3 - Q1)
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Outliers in Box Plots (Greater)
values < Q1 - 1.5(Q3 - Q1)
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Standardised score
value - mean / Standard Deviation
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Index Number
value / value in base year X 100
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Weighted Index
sigma (index number X weight) / Sigma weights
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seasonal effect
real value - value from trend line
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If all possible outcomes are equally likely?
number of matching outcomes / total outcomes
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Relative Frequency
probability of something happening = number of times it happened / number of trials
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expected frequency?
expected frequency = number of trials X probabilty of outcome
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mutually exclusive
P (A or B) = P (A) + P (B)
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Non-Mutually Exclusive
P (A or B) = P (A) + P(B) - P(A and B)
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Independent Events
P (A and B) = P (A) X P(B)
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At least one
P (at least 1) = 1 - P(none)
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General Multiplication Law
P(A and B) = P(A) X P(B given A occurs)
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Rearranged Conditional Probabilities
P (B given A occurs) = P(A and B) / P(A)
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## Other cards in this set

### Card 2

Frequency?

#### Back

Frequency = Class Width X Frequency Density

### Card 3

#### Front

Position of Median

Q1

D1