Multiple choice general knowledge Quartile Deviation is also called Inter-quartile Range Coefficient of Range Semi Inter-quartile Range None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation Quartile deviation is synonymous with 'semi-inter-quartile range' because it equals half the inter-quartile range. Inter-quartile range is Q3-Q1, while quartile deviation is (Q3-Q1)/2.