The amount of data you are using to formulate a conclusion in data, in which you minus the highest number from the lowest to get the "range".

"The range of a set of is the difference between the highest and lowest values in the set."

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Rang is a measurement of a spread and is greatly sensitive to outliers. One value (outlier) can greatly change the range.

for example:

2 , 6 , 9 , 9 , 19

the range is 19 - 2 = 16

but if the data set is 2 , 6 , 9 , 19 , 60

the outlier 60 will greatly change the range.

The range for this data set is 60 - 2 = 58


external image quartiles-a.gif This example shows a set of numbers with quartile's. The range for this example would be 5 because that's the difference between the highest and lowest number in the set. I chose an example with quartile's just to show that you can use the range to find more than just limitations of a set. We learn more on quartile's in chapter 3. (Dillon Hernandez)

angela shen:
The range of a data set is the difference between its highest and lowest data values.
range=highest value (max) - lowest value (min)
3, 3, 4, 5, 6, 7, 8