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Process: Divide the interval from the smallest to the largest measurements into an arbitrary number of subintervals or classes of equal length.

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Method of left inclusion: Include the left class boundary point but not the right boundary point in the class.

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Relative frequency can give us further information:

-the proportion of measurements that fall in a particular class or group of classes

-the probability that a measurement drawn at random from a set will fall in a particular class or group of classes

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Different samples from the same population will produce different histograms.

©1998 Brooks/Cole Publishing/ITP