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The first widely used individual intelligence test in the United States was the
StdDev
A measurement that quantifies the amount of variation or dispersion in a set of data values, same as Standard Deviation.
Mean
The mean value of a collection of numbers, obtained by dividing the total sum of the numbers by the quantity of numbers in the collection.
Median
The middle value in a dataset when it is arranged in ascending or descending order, or the average of the two middle values when the dataset has an even number of observations.
Interquartile Range
A measure of variability, calculated as the difference between the 25th and 75th percentiles of a data set.
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