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### 7 Cards in this Set

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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 largest value - smallest value -heavily influenced by outliers -only considers 2 values - not very informative measure Measure of dispersion - range 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 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 summary measures that divide a data set into 4 equal parts quartiles -based on scale of 100 -breaks data set into 100 parts containing 1% of the data set each percentiles -other side of percentiles -to find: #values less than x1/total # of values in data set *100 percentile rank