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Using Frequency Distributions

A frequency distribution is a chart that groups data into different classes and then graphically shows how many data points fall into each class. A frequency distribution allows the reader to see easily the approximate center and spread of the data. Table II shows the frequencies of different hemoglobin concentrations. Figure 2 is a histogram of the data.

    Table II
    Frequency distribution of blood hemoglobin levels from healthy women determined on the Coulter Gen S
    Hemoglobin (gm/dL)
    Number of Women
    6 - 8
    8 - 10
    10 - 12
    12 - 14
    14 - 16
    16 - 18

    Figure 2

    Frequency Distribution Blood Hemoglobin Levels from 48 Healthy Women Determined on the Coulter Gen S