# Statistics

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1. Probability given that.
P(A/B)=P(A∩B)/P(B)
2. Multiplication rule
• P(A∩B)= P(A/B) x P(B)
•               P(B/A) x P(A)
3. Independent if
• P(A/B)=P(A)
• P(B/A)=P(B)
• P(A∩B)=P(A) x P(B)
4. Mutually exclusive if
P(A∩B) = 0
5. Complementary probability
P(A') = 1- P(A)
6. Skewness formula
7. Skewness measures
• Q- Q< Q- Q2 positively skewed
• Q2 - Q1 > Q3 - Q2 negatively skewed
• Q2 - Q1 = Q3 - Q2 symmetrical

• mode = median = mean symmetrical
• mode < median < mean positive skew
• mode > median > mean negative skew
8. Discrete random variables: variance.
Var(X) = E(X2) - [E(X)]2
9. Discrete random variable: expected value coded
E(aX+b) = aE(X) + b
10. Discrete random variable: variance value coded
Var(aX+b) = a2Var(X)
11. Discrete uniform distribution
12. Normal distribution finding Z value
Z=X-μ/σ
 Author: valentinafunaro ID: 294537 Card Set: Statistics Updated: 2015-02-01 22:03:19 Tags: maths s1 Folders: Description: s1 Show Answers: