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
| 1
|
8 - 10
| 2
|
10 - 12
| 10
|
12 - 14
| 25
|
14 - 16
| 9
|
16 - 18
| 1
|
Figure 2
Frequency Distribution Blood Hemoglobin Levels from 48 Healthy Women Determined on the Coulter Gen S
