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7 Cards in this Set
- Front
- Back
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values that are very small or large compared to the majority of values in the data set
-means very sensitive to this - weakness of means |
outlier
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largest value - smallest value
-heavily influenced by outliers -only considers 2 values - not very informative measure |
Measure of dispersion - range
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most commonly used
-average distance between each value in data set and the mean -lower values mean that scores are clustered closer to the mean -higher values mean that scores are spread out farther from the mean -obtained by taking the positive square root of the variance. |
measure of dispersion - standard deviation
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for a symmetrical, unimodal, bell-shaped distribution (normal distribution:
-68% of observations lie within 1 standard deviation of the mean - 95% of observations lie within 2 standard deviations of the mean -99.7% of observations lie within 3 standard deviations of the mean |
empirical rule
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summary measures that divide a data set into 4 equal parts
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quartiles
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-based on scale of 100
-breaks data set into 100 parts containing 1% of the data set each |
percentiles
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-other side of percentiles
-to find: #values less than x1/total # of values in data set *100 |
percentile rank
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