Question

Quartile deviation is based on the

• A. highest 50% of the items
• B. lowest 25% of the items
• C. middle 50% of the items
• D. the highest 25% of the items

Answer 1

Answer: (C)

Since Q.D. $ = \frac{Q_{3} - Q_{1}}{2} $, therefore, the lowest 25% and highest 25% of observations do not affect Q.D. It depends upon middle 50% of the items.