Measures of Spread
Measures of spread are used to describe variability in a data set.
The simplest measure of spread is the range. The range is the difference between the maximum and minimum values.
The median of a sample cuts the data set in half. If we cut the halves in half, such that the data is divided into quarters, we can find the quartiles of a data set. The first quartile calculates the value one quarter of the way up the list. The second quartile calculates the value two quarters up the list (the median value).The third quartile calculates the value three quarters of the way up the list and so on. Quartiles are useful in determining whether or not a distribution is symmetric about the median.
The interquartile range is the difference between the first and third quartiles. This is often favored over the range as it is not impacted by outlying low and high values.
Use the slider below to choose the size of your sample set.
Then, choose an endpoint for the range of the data from the drop-down menu.
Click "Generate Sample Set" to generate a collection of integers. A histogram of the sample set will appear in the plot to the right.
Use the check boxes to select the different measures of spread for your data set.
numbers between 1 and 102050100
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