Statistics

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Author:
valentinafunaro
ID:
294537
Filename:
Statistics
Updated:
2015-02-01 17:03:19
Tags:
maths s1
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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

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