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19-20

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Term
Definition
Bias   the difference between this estimator's expected value and the true value of the parameter being estimated  
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Interquartile Range   a measure of variability, based on dividing a data set into quartiles  
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Lower Quartile   The first quartile, a measure of variability, based on dividing a data set into quartiles  
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Mean   the average of a set of numbers  
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Mean absolute deviation   a dataset is the average distance between each data point and the mean  
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Median   place the numbers in value order and find the middle number  
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Mode   The number which appears most often in a set of numbers  
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Random sampling   A selection that is chosen randomly  
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Range   The difference between the lowest and highest values  
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Representative sample   a group that closely matches the characteristics of its population as a whole  
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Upper quartile   the median of the upper half of a data set. This is located by dividing the data set with the median and then dividing the upper half that remains with the median again, this median of the upper half being the upper quartile  
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