PRC-2 · Chapter 8 · Question 42 of 60
Which of the following is the correct formula to calculate the Semi-Interquartile Range (often termed Quartile Deviation)?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) (Q3 - Q1) / 2
Explanation
The Interquartile Range is Q3 - Q1. The prefix 'semi' mathematically indicates that this value is halved, resulting in the standard formula (Q3 - Q1) / 2.
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