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Glossary 2.7 Glossary
- distribution.
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The set of values and how frequently each value appears in a dataset.
- frequency table.
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A mapping from values to frequencies.
- frequency.
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The number of times a value appears in a sample.
- skewed.
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A distribution is skewed if it is asymmetrical, with extreme quantities extending farther in one direction than the other.
- mode.
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The most frequent quantity in a sample, or one of the most frequent quantities.
- uniform distribution.
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- outlier.
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An extreme quantity in a distribution.
- standardized.
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A statistic is standardized if it is expressed in terms that are comparable across different datasets and domains.
- pooled standard deviation.
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A statistic that combines data from two or more groups to compute a common standard deviation.
- Cohen’s effect size.
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A standardized statistic that quantifies the difference in the means of two groups.
- practically significant.
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An effect is practically significant if it is big enough to matter in practice.
