Question

What are the guidelines of classification?

Answer 1

Following are some guidelines following while classification: 

• The number of classes should generally between 4 and 15.
• Exclusive classes should be formed for better continuity between the class intervals. 
• The width of the classes should be usually kept constant throughout the distribution. 
• Avoid open-end classes. 
• The classes should be arranged in ascending or descending order. 
• The lower limit of the first class should be either ‘o’ or multiple of 5.