Step 2: List the Class Intervals

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The page below is a sample from the LabCE course Descriptive Statistics. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Step 2: List the Class Intervals

Here are the classes we will use for this example. A convenient way to list the intervals is to place the lowest values at the top and the highest values at the bottom.
Intervals
65–70
70–75
75–80
80–85
85–90
90–95
95–100
100–105
105–110
110–115