Chapter 2 formulas

Chapter 2 formulas - Formulas Chapter Two: Methods of...

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Formulas Chapter Two: Methods of Describing Sets of Data Randall Miller Key Symbols o Mean : Sample = x Population = µ o Variance : Sample = s 2 Population = σ 2 o Standard deviation : Sample = s Population = o Median : Sample = M Formulas o Measures of Central Tendency Sample Mean : ( ) , n i i i i where x x x xxx n = = = = ++ 3 1 123 1 Sample Median : Middle value when data is ranked in order Sample Mode : Value that occurs most often o Measures of Variation Range : Difference between largest and smallest value Sample Variance : ( ) 2 2 1 2 2
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