# SFS - Student Formula Sheet Parameter/Statistic Population...

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Unformatted text preview: Student Formula Sheet Parameter/Statistic Population Sample mean Population x N μ = Sample x x n = variance ( 29 2 2 2 2 2 ( ) 1 1 ( 1) x x s n x x s n n n- =- =--- standard deviation 2 σ σ = 2 s s = coefficient of variation (CV) 100 CV σ μ = 100 s CV x = interquartile range (IQR) Q 3 – Q 1 outliers 1 3 1.5 1.5 x Q IQR x Q IQR <- + z-score for single data point x z μ σ- = x x z s- = z-score for sample mean / x z n μ σ- = Formulas for Correlation and Regression Statistic Formula Use r 1 1 n i i i x y x x y y s s n =--- indicates strength of correlation on [-1,1], r 2 is the fraction of variation in y, explained by the variation in x b y x s r s slope of regression line a y bx- y intercept of regression line e ˆ ˆ Given y y y a bx- = + residuals used to see if any remaining structure exists Interpreting |r| 0 – 0.2 negligible 0.2 – 0.4 low 0.4 – 0.6 moderate 0.6 – 0.8 high 0.8 – 1 very high Formulas for Distributions Probability Rules 2 2 2 2 2 ( ) x N x N μ σ σ μ- = =- ∑ ∑ { }...
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## This note was uploaded on 04/02/2008 for the course MATH 283 taught by Professor Brown during the Spring '08 term at NMT.

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SFS - Student Formula Sheet Parameter/Statistic Population...

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