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 all of 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