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Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition by Michael D. Kennedy

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Defined Interval
____ 14. Choose the method Defined Interval. This is an equal interval method, but instead of the interval size being chosen by the formula (High – Low)/N, it is chosen by the user and adjusted so that the numbers look nice. Type 4000 in the Interval Size box and click the histogram. Note that defining the interval determines the number of classes. How many? __________. Click OK. Uncheck Show class ranges using feature values. Click Apply, then OK. Note the results on the map and in the T/C. Again there are empty classes.

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