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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) |