How to find quartiles Q1 Q3 interquartile range IQR of data set using Casio Calculator STAT mode
© The Maths Studio (themathsstudio.net)
This is a repeat of the same example used in the last video where the quartiles and the interquartile range are calculated using the STAT mode on the Casio FX-82AU PLUS II scientific calculator. Note that the FX82AU PLUS does not have the functionality to compute Q1, Q2 (median) and Q3.
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The interquartile range (IQR) is a measure of statistical dispersion, specifically the range between the first quartile (Q1) and the third quartile (Q3) in a dataset. To find the interquartile range:
1. *Order the data:* Arrange the scores in ascending order from smallest to largest.
2. *Find Q1 and Q3:*
Q1 is the median of the lower half of the dataset (excluding the overall median if the dataset has an odd number of observations).
Q3 is the median of the upper half of the dataset.
3. *Calculate IQR:*
IQR = Q3 - Q1
This range gives you an idea of the spread of the middle 50% of the data. It's a useful measure, especially when dealing with datasets that might have outliers, as it is less sensitive to extreme values than the range or standard deviation.
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