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Unformatted text preview: The proportions of the data set each class represents All the proportions add up to 1 • B.c. categories are mutually exclusive • • Measures of center o Mean Balance point b.c. balancing each observation’s distance from the mean • Deviations It is affected by every # in the data set Outliers can cause it to give us a misleading idea of the center of the data set Every set of numerical data has one and only one o Median: Midpoint Not affected by outliers Used for incomes → more helpful than mean Doesn’t describe any other values in data set One and only one per data set o Mode Most frequent observations in the data set Not limited to just one mode Only descriptive stat for categorical data Outliers don’t influence at all o Basic Using mean, median, and mode what does center mean? • Focal point • Helps describe distributions...
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- Winter '09
- Frequency, #, Histogram, Statistical charts and diagrams