How do I determine the range?
The range, which is the simplest and least precise of the measures of variability, is determined by subtracting the lowest score in a set of data from the highest score. It provides a measure that considers the two most extreme scores in a set without accounting for any of the other scores between the extremes. The formula for the range is r = h – l,
Where
r = range,
h = the highest score in the set, and
l = the lowest score in the set.
For example, if a set of scores on a statistics exam included the following scores: 100, 82, 81, 80, 80, 78, 2, then the range would be r = 100 – 2 = 98. If you interpret the range as a measure of variability, you may think the scores in the set had a high level of variability since they spanned 98 points. But when you examine the other scores in the set, you can see they are very similar and have minimal variability. This demonstrates how the range can be a less precise measure of variance.
5 thoughts on “How do I determine the range?”
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