Part 2 Exploratory Data Analysis Chapter 3 Describing

Part 2 Exploratory Data Analysis Chapter 3 Describing Data: Numeric Descriptive Statistics © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 1

• Introduction – Location – Dispersion – Skewness • Central Location Measures – Arithmetic Mean (Average) – Median © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 2

• Central Location Measures continued – Mode – Which central location measure is best? © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 3

• Non-central Location Measures – Quartiles – Percentiles © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 5

© Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 6

• Measures of Dispersion – Range – Variance © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 7

• Measures of Dispersion continued – Standard Deviation – Coefficient of Variation © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 8

• Measure of Skewness – Symmetrical Distribution – Positively Skewed Distribution © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 9

• Measure of Skewness continued – Negatively Skewed Distribution – Pearson’s Coefficient of Skewness © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 10

• The Box Plot © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 11

• Choosing Valid Descriptive Statistics Measures • Using Excel (2007) to Compute Descriptive Statistics – Function Keys – Data Analysis Add-in © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 12

© Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 13

• Summary • Exercises © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 14

End of Chapter 3 Applied Business Statistics Methods and Excel-based Applications Third edition TREVOR WEGNER ISBN 978 -0 -70217 -774 -3 © Juta and Company Ltd, 2012 Applied Business Statistics Methods and Excel-Based Applications 3 rd Edition 15