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7 Cards in this Set

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  • Back
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
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
-based on scale of 100
-breaks data set into 100 parts containing 1% of the data set each
-other side of percentiles
-to find: #values less than x1/total # of values in data set *100
percentile rank