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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 3: Sort the Data

Now we sort the observations into the appropriate classes by tallying. In order to keep track of what has been tallied, some people put an X by the number in the raw data table once it has been tallied. If a point falls on the boundary between two classes, it is placed in the greater class. A data point of 70 is placed in the class 70-75, not the class 65-70.

    Intervals Tally
    65 - 70 \\
    70 - 75 \\\\ \\
    75 - 80 \\\\ \\\\ \
    80 - 85 \\\\ \\\\ \\\\ \\\\ \\\\ \\\\ \
    85 - 90 \\\\ \\\\ \\\\ \\\\ \\\\
    90 - 95 \\\\ \\\\ \\\\ \\\
    95 - 100 \\\\ \\\\ \\\
    100 - 105 \\\\ \\\\
    105 - 110 \\\\
    110 - 115 \\\\