Intro to Stat_Part_5

# Intro to Stat_Part_5 - Chapter 2 Descriptive Statistics 2.1 Summary of Formulas1 Commonly Used Symbols The symbol means to add or to nd the sum n =

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Chapter 2 Descriptive Statistics 2.1 Summary of Formulas 1 Commonly Used Symbols The symbol Σ means to add or to ﬁnd the sum. n = the number of data values in a sample N = the number of people, things, etc. in the population x = the sample mean s = the sample standard deviation μ = the population mean σ = the population standard deviation f = frequency x = numerical value Commonly Used Expressions x * f = A value multiplied by its respective frequency x = The sum of the values x * f = The sum of values multiplied by their respective frequencies ( x - x ) or ( x - μ ) = Deviations from the mean (how far a value is from the mean) ( x - x ) 2 or ( x - μ ) 2 = Deviations squared f ( x - x ) 2 or f ( x - μ ) 2 = The deviations squared and multiplied by their frequencies Mean Formulas: x = x n or x = f · x n μ = x N or μ = f · x N Standard Deviation Formulas: s = q Σ ( x - x ) 2 n - 1 or s = q

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## This document was uploaded on 10/31/2011 for the course STA 2023 at University of Florida.

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Intro to Stat_Part_5 - Chapter 2 Descriptive Statistics 2.1 Summary of Formulas1 Commonly Used Symbols The symbol means to add or to nd the sum n =

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