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Statistics
Term | Definition |
---|---|
Mean | ∑x÷f or ∑fx÷∑f |
Median | n÷2 then interpolate |
Interpolation | LB +{[(n÷2-F)÷FC]×C} |
Coding | y=x-a/b |
Standard Deviation | √(∑x²/n)-(∑x/n)² |
Histograms | Frequency= Class Width x Frequency Density |
Skew | 3((mean-median)/standard deviation) |
Positive Skew | Q2- Q1< Q3-Q2 Mode< Median<Mean |
Negative Skew | Q2- Q1> Q3-Q2 Mean<Median<Mode |
E∪F | Everything in E, F or both |
E∩F | Outcomes in E and F |
E' | Outcomes not in E |
P(A∪B) = | P(A) + P(B) - P(A∩B) |
P(A|B) | P(A∩B)/P(B) |
Mutually Exclusive: P(A∪B) = | P(A) + P(B) |
Mutually Exclusive: P(A|B) = | 0 |
Independent Events: P(A∩B)= | P(A) X P(B) |
Independent Events: P(A|B) = | P(A) |