It is not only important to understand what descriptive data represent but, if possible, to see it as well. One way to do this is through the use of a frequency distribution, a visual representation of a distribution of data.

Table 1 shows 25 scores on a math test for which a frequency distribution will be created.

Table 1 Sample Math Scores

The first step in creating a frequency distribution is to define the class interval that will be used. A class interval is a range of numbers, and the first step in the creation of a frequency distribution is to define how large each interval will be.

Some guidelines for creating a class interval are as follows:

  • Select a class interval that has a range of 2, 5, ...
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