Adjustment for Continuity in Inclusive Method
When using inclusive class intervals for a continuous variable, a 'gap' appears between classes. How is continuity restored?
- By adding 1 to all upper class limits
- By subtracting half the gap from lower limits and adding half the gap to upper limits of all classes — Correct Answer
- By multiplying all class limits by 2
- By changing to qualitative classification
Explanation:
Correct Answer Explanation
Continuity is restored by: (1) Find the difference between lower limit of second class and upper limit of first class → (2) Divide by 2 → (3) Subtract this value from all lower class limits and add it to all upper class limits.
Step-by-Step Example (Table 3.4):
- Gap = 900 − 899 = 1
- Adjustment = 1/2 = 0.5
- New lower limits = old lower limit − 0.5
- New upper limits = old upper limit + 0.5
- So 800–899 becomes 799.5–899.5
Key Points:
- After adjustment: Adjusted Class Mark = (Adjusted UCL + Adjusted LCL) / 2
📚 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.
