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### 23 Cards in this Set

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 Range -the easiest measure of dispersion Calculating Range Subtract lowest score from highest score (38-18=?) Problem with Range - Highly susceptible to the influence of extremely high or low outliers 50th Percentile -The point in an ordered distribution of scores below which 50% of the scores fall -An indicator of position Quartiles -definition- -Points in an array that divide the scores into 4 equally sized groups Interquartile Range or Hinge Spread -Variant of the rante that manages to avoid the problem of outliers by focusing on the middle 50% of scores Problem with Interquartile Range Fails to say anything about the positioning or values of other scores in the data set Semi-interquartile Range -definition- -Provides a general indicator of how scores vary around the median Semi-interquartile Range is not affected by... not affected by outliers Calculating semi-interquartile range Divide the interquartile range by 2 Deviation -definition- -Distance between a score and the mean Variance is also known as... The Mean Square Variance -definition- -The arithmetic average of the squared deviation Standard Deviation -definition- -Square root of the variance that tells us how far the average score in a distribution varies from the mean If the scores in a distribution are spread out then.... If the scores are compacted then... 1 - If spread out, it is a LARGE standard deviation 2 - If compact, a small standard deviation What does standard deviation allows us to compare? Standard deviation allows us to compare the variability that exists among groups or samples. Best level(s) of measurement for a standard deviation Ratio or Interval Boxplot is also known as a... Box-and-Whisker diagram Boxplot -definiton- - A graphical means of summarizing how th evalues in a data set are dispersed 5 number summary -definition- - A boxplot that depicts 5 important indicators of dispersion The 5-number summary indicators 1. Maximum 2. 3rd Quartile 3. Median 4. 1st Quartile 5. minimum Extreme Scores -definition- -Values that fall a distance that's more than 3 times the value of the interquartile range beyond the hings of the central box Index of Dispersion -definition- Provides a ratio of the number of unique pairs that can be created out of the observed scores to the total number of unique pairs possible