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Descriptive Statistics2

Descriptive Statistics2 - 100 • Interquartile range...

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1 Descriptive Statistics 2 4/4/2011 Announcements Chapter 11 HW due Friday Bring calculators from now on Or, with regard to the level of measurement Nominal Data: Mode Ordinal Data: Mode, Median Interval/Ratio Data: Mode, Median, Mean Dispersion How much variation occurs across the data. For nominal data: Eyeball method Frequency distribution Measures of Dispersion Only use with ordinal or higher data Range Quantiles Standard Deviation Variance Range Minimum Maximum Range is maximum minus minimum Problem: doesn’t tell you much about what’s inside
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2 Quantiles Helps understand the inside of a distribution Percentiles = Percentage below a certain value. Other Quantiles Quartile: Four cuts of the data: 25%, 50%, 75%, 100%. Quintile: Five cuts of the data: 20%, 40%, 60%, 80%, 100%.
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