Lecture 12 - Statistics (Mean, Mode, Variance, Stnd. Dev.)

# Lecture 12 - Statistics (Mean, Mode, Variance, Stnd. Dev.)...

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2/21/2010 1 TODAY’S TOPICS: Statistics Engr 160 Statistics How will learning Statistics help me? Connecting Your Background Learning to measure variation helps engineers to determine the cause(s) of variation. – Controlling variation is very important in quality control – Understanding variations helps us determine the likelihood that something will happen – Understanding variations helps us determine the cause of variations Engr 160

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2/21/2010 2 What is Statistics? Statistics is a: Mathematical Science pertaining to: Collection Analysis Interpretation or explanation and presentation of data . Prediction and forecasting based on data. Engr 160 Measures of Central Tendency • Mode: The most common value in a sample • Median: The “middle” value in the sample • Mean: The average value N i x x Engr 160 1 i N
2/21/2010 3 Variation Variation is the scatter, or dispersal about the mean  2 2 1 2 1 tan N i i xx Variance S N S dard Deviation S S 

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## This note was uploaded on 02/09/2012 for the course ENGR 160 taught by Professor Sengupta during the Spring '07 term at Iowa State.

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Lecture 12 - Statistics (Mean, Mode, Variance, Stnd. Dev.)...

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