Cumulative frequency distributions report the frequency, proportion, or percentage of cases at a particular score or less. Thus, the cumulative frequency of a score is calculated as the frequency of occurrence of that score plus the sum of the frequencies of all scores with a lower value. Cumulative frequency distributions are usually displayed with the aid of tables and graphs and may be put together for both ungrouped and grouped scores.
A cumulative frequency table for distributions with ungrouped scores typically includes the scores a variable takes in a particular sample, their frequencies, and the cumulative frequency. In addition, the table may include the cumulative relative frequency or proportion, and the cumulative percentage frequency. Table 1 illustrates the frequency, ...
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