Histograms_SP08_BB_1

Histograms_SP08_BB_1 - Lecture Outline Measures of Central...

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Descriptive Statistics Lecture Outline y Measures of Central Tendency y Measures of Variability y Visualizing Data y Reporting Descriptive Statistics Visualizing your data… y Tables/Charts (go over in book) y Figures/Graphs y Histograms & Bar Charts (on your own) y Stem & Leaf Plots y Box & Whisker Plots Minor (but important) point y Histograms: y Interval/ratio data y Continuous y No gaps between bars y Controls for random noise while still preserving trends y Bar Chart: y Nominal/ordinal data y Non-continuous y Gaps between bars 0 20 40 0 20 40
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Histograms Quiz 4 64.00 67.00 72.00 76.00 83.00 85.00 85.00 87.00 87.00 90.00 90.00 91.00 92.00 92.00 93.00 93.00 95.00 96.00 97.00 97.00 97.00 99.00 100.00 100.00 1. Look at your data to decide on an appropriate number of categories. y Do not want too many categories because may “see” things that are actually not important. y Do not want too few categories because may overlook important trends in your data. ¾ For larger datasets, aim for at least 10 categories and no more than ~15.
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Histograms_SP08_BB_1 - Lecture Outline Measures of Central...

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