Frequently Used Statistics Formulas and Tables

Frequently used Statistics Formulas and Tables chapter 2. highest value - lowest value Class Width = (increase to next integer). number classes upper limit + lower limit Class Midpoint =. 2. chapter 3 chapter 3. n = sample size Limits for Unusual Data N = population size Below : - 2 . f = frequency Above: + 2 . =sum w = weight Empirical Rule About 68%: - to + . x About 95%: -2 to + 2 . Sample mean: x =. n About : -3 to + 3 . x Population mean: =. N s Sample coefficient of variation: CV = 100%. ( w x) x Weighted mean: x =. w . Population coefficient of variation: CV = 100%. ( f x) . Mean for frequency table : x =. f highest value + lowest value Sample standard deviation for frequency table : Midrange =. 2 n [ ( f x 2 ) ] [ ( f x) ] 2. s=. n (n 1). Range = Highest value - Lowest value x x Sample z-score: z =. ( x x ) 2 s Sample standard deviation: s =.

Chapter 11 2 2 ( ) (row total)(column total) where sample size Tests of Independence . . ( 1)( 1) Goodness of fit . . (number of categories) 1 OE E E df R C df χ − =∑= =−− =− Chapter 12 One Way ANOVA 2 2 22 all groups 2 2 number of groups; total sample size () ( ) where . . 1.. TOT TOT TOT i TOT BET i i Wi i TOT BET W BET BET BET BET ...

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