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9 Cards in this Set
- Front
- Back
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Central Tendency
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where is the center, normal, typical; measured by mode, median, and mean
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• Mode
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most frequently occurring
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• Median
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middle score value, 50%ile
o Good for skewed data b/c not affected much by skews o NOT used w/ nominal data |
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• Mean
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arithmetic mean, y w/ a bar over it, intervals between the #s must be meaningful
o Interval or Ratio data o Sensitive to outliers, outliers pull mean towards themselves |
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Dispersion
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how spread out the data are; variability
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• Range
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range of values;
o only w/ Ordinal, Interval, Ratio but NOT Nominal |
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• Inter-Quartile Range (IQR)
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middle 50% of the data; 25th%ile – 75th%ile
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• Variance
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square of the standard deviation
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• Standard Deviation
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square root of the variance; typical deviation from the mean (the typical case)
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