# Statitics

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- Created by: Pearl Desai
- Created on: 08-02-14 14:45

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- Statitics
- Quartiles
- IQR=Q3-Q1
- Q1 is lower quartile
- Q2 is the median
- Q3 is upper quartile
- The range = Q4-Q0
- Deciles- divide the dataset into 10 parts
- Percentiles - divide dataset into 100 parts
- Quartiles - divide dataset into 4 parts

- Skewness
- Positively skewed
- Q3-Q2>Q2-Q1
- Mode < median < mean
- coefficient
- Q3-2Q2+Q1/Q3-Q1

- coefficient

- 3x(mean-median) / standard deviation
- mean-mode/standard deviation
- Negatively skewed
- mean < median < mode
- Q3-Q2 < Q2-Q1

- Symmetric distribution
- Q3-Q2 = Q2-Q1
- median = mean

- Positively skewed
- Coding
- Mean of Y = a x mean of X +b
- SD of Y = standard deviation of X
- Variance of Y = a2 x variance of X

- Discrete random variable
- pi = 1

- Probability
- AUB is the union A and B
- P(XUY) = P(X) +P(Y)- P(XnY)
- A' means 'does not happen'
- A|C is the intersection of events A and C
- P(A|B) =P(AnB)/P(B)
- P(AUB) = P(A) + P(B)

- Quartiles

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