Frequency Distributions

A set of unorganized data is difficult to digest and understand. Consider a study of the serum cholesterol levels of a sample of 200 men: a list of the 200 levels would be of little value in itself. A simple first way of organizing the data is to list all the possible values between the highest and the lowest in order, recording the frequency (/) with which each score occurs. This forms a frequency distribution. If the highest serum cholesterol level were 260 mg/dl, and the lowest were 161 mg/dl, the frequency distribution might be as shown in Table 1-1

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