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23 Cards in this Set
- Front
- Back
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Range
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-the easiest measure of dispersion
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Calculating Range
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Subtract lowest score from highest score
(38-18=?) |
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Problem with Range
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- Highly susceptible to the influence of extremely high or low outliers
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50th Percentile
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-The point in an ordered distribution of scores below which 50% of the scores fall
-An indicator of position |
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Quartiles
-definition- |
-Points in an array that divide the scores into 4 equally sized groups
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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
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Problem with Interquartile Range
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Fails to say anything about the positioning or values of other scores in the data set
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Semi-interquartile Range
-definition- |
-Provides a general indicator of how scores vary around the median
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Semi-interquartile Range is not affected by...
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not affected by outliers
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Calculating semi-interquartile range
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Divide the interquartile range by 2
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Deviation
-definition- |
-Distance between a score and the mean
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Variance is also known as...
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The Mean Square
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Variance
-definition- |
-The arithmetic average of the squared deviation
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Standard Deviation
-definition- |
-Square root of the variance that tells us how far the average score in a distribution varies from the mean
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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 |
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What does standard deviation allows us to compare?
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Standard deviation allows us to compare the variability that exists among groups or samples.
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Best level(s) of measurement for a standard deviation
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Ratio or Interval
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Boxplot is also known as a...
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Box-and-Whisker diagram
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Boxplot
-definiton- |
- A graphical means of summarizing how th evalues in a data set are dispersed
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5 number summary
-definition- |
- A boxplot that depicts 5 important indicators of dispersion
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The 5-number summary indicators
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1. Maximum
2. 3rd Quartile 3. Median 4. 1st Quartile 5. minimum |
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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
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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
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