Explain the methods adopted to determine class size of data.

Explanation

The grouping of the raw data requires determining of the number of classes in which the raw data are to be grouped and what will be the class intervals. The selection of the class interval and the number of classes, however, depends upon the range of raw data. For example, if raw data is more expanded we can take class interval as 0-10, 10-20, etc. if it is less expanded, class interval can be 0-2, 2-4, etc.