When to Use Unequal Class Intervals
In which two situations are UNEQUAL class intervals used in frequency distribution?
- When data has no variability and when variables are qualitative
- When the range is very high (e.g., income data) and when many values concentrate in a small part of the range — Correct Answer
- When the sample size is small and when Census data is used
- When data is bivariate and when time series data is used
Explanation:
Correct Answer Explanation
Unequal class intervals are used in two situations:
Situation 1: Very High Range
- When data like income has a very high range (near zero to hundreds of crores).
- Equal intervals would either create too many classes (moderate intervals) or suppress information (large intervals).
Situation 2: Concentrated Data
- When many values are concentrated in a small part of the range — equal intervals would give too little detail in the concentrated area.
- Example: In marks distribution, 63% of students scored 40–70, so these classes are split into narrower intervals (40–45, 45–50, etc.).
📚 About this Topic — CH-3: Organisation of Data
This multiple choice question is from CH-3: Organisation of Data, NCERT Books, Statistics for Economics. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from CH-3: Organisation of Data to strengthen your preparation.
