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17 Nov 2016 In both semesters the mean and median tutorial group size is 5 students, The method Excel uses to calculate quartiles is not commonly used and tends to Excel has a lot of underused function that can greatly improve your data analysis. The range of values from Q1 to Q3 are called the inter-quartile range(IQR).27 Feb 2018 Returns the inter quartile range Excel (IQR), also called the mid-spread or middle fifty. Steps: Step 1: Put the numbers in order. Step 2: Find the median. Step 3: Place parentheses around the numbers above and below the median. Not necessary statistically, but it makes Q1 and Q3 easier to spot. Step 4: Find Q1 and Q3. Step 5: Subtract Q1 from Q3 to find the interquartile range. 5 May 2010 In this MS Excel tutorial from everyone's favorite Excel guru, of free video lessons, you'll learn how to calculate range & interquartile range for 27 Aug 2013 Excel has a QUARTILE() function which may produce results that don't always look One method of eliminating extreme values is to use an interquartile range. 27 Feb 2018