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Calculate measures of central tendency and create basic data displays.
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Middle value when data is ordered. For even count, average the two middle values.
Most frequently occurring value.
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Avoid these 3 frequent errors
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Data:
Ordered:
Show the five-number summary: Min, Q1, Median, Q3, Max
Show data values organized by their leading digits.
Data: 23, 25, 31, 34, 37, 42, 45
| Stem | Leaf |
|---|---|
| 2 | 3 5 |
| 3 | 1 4 7 |
| 4 | 2 5 |
| Data Type | Display |
|---|---|
| Categorical | Bar graph, circle graph |
| Numerical | Histogram, dot plot, box plot |
| Comparing two groups | Double bar graph, side-by-side box plots |
Key idea: The mean is affected by outliers; the median is not. Choose the median for skewed data.