Measures of Variability

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10 Terms

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Variability
The degree to which scores in a dataset differ from each other.
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Measures of Central Tendency
Statistical measures used to describe the center of a dataset, commonly including mean, median, and mode.
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Range
The difference between the largest and smallest scores in a distribution.
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Deviation Score
The difference between an individual score and the mean of the dataset.
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Sum of Squares
The total obtained from squaring each deviation score and summing them.
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Variance
A measure of variability calculated by dividing the sum of squares by N minus one.
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Degrees of Freedom (df)
The number of independent pieces of information available to estimate a parameter or a statistic.
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Standard Deviation
A measure of how much scores in a dataset deviate from the mean on average.
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Interquartile Range (IQR)
The difference between the upper (third) quartile and lower (first) quartile of a dataset.
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Median
The middle value that divides a dataset into two equal halves.