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Measures of Spread, Highest Score, Distance From the Lowest, Problem of Clustering Differences, Problem of Outliers, Interquartile Range, Effect of Extreme Scores, Trimmed Samples, Loss of Information, Average Deviations. These are the important points of Psychology.
Typology: Slides
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** Problem of outliers
Data Set I:
8, 8, 9, 10, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 14,14, 15, 15, 16, 17
Range = 9 Interquartile Range = 3
Data Set II:
1, 2, 3, 10, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 14,14, 15, 21, 25, 30
Range = 29 Interquartile Range = 3
These are here defined as descriptive statistics.
average of the summed, squared-deviations about the mean
2 2
the square root of the average of the summed squared deviations about the mean
2
As inferential statistics
2 2
2
See the difference