Friday, July 13, 2018

Variables

Random Variable: 

  • Placeholders for the possible values of some process.
  • Commonly use X, Y, Z to notate random variables.
    • Usually represented by capital letters. (X, Y, Z)


Observed Values: 

  • observed values for each variable(X, Y, Z)
    • usually represented by lowercase letters(x, y, z)


Summation:
i=1n xi


Notation for the Mean: 

- 1/n means the whole summation is divided by the no. of variables

n1 i=1n xi


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