How do I calculate the interquartile range?
To calculate the interquartile range (IQR), you first need to find the first quartile (Q1) and the third quartile (Q3).
What are Q1 and Q3?
Q1 is the median of the lower half of your data set, and Q3 is the median of the upper half.
Can you show me an example?
Sure! For the data set {1, 3, 5, 7, 9}, Q1 is 3 and Q3 is 7. The IQR is Q3 - Q1, which is 4.
What if my data set has an even number of values?
In that case, you take the average of the two middle numbers for both Q1 and Q3.
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