Range and interquartile range (IQR) are two ways to understand how spread out data is. But they are quite different from each other.

Range:

• To find the range, you do this: $\text{Range} = \text{Maximum} - \text{Minimum}$
• The range shows how wide the data values are.
• It's easily influenced by extreme values, which are called outliers.

Interquartile Range (IQR):

• To figure out the IQR, you use this: $\text{IQR} = Q_3 - Q_1$ Here, $Q_3$ is the third quartile, and $Q_1$ is the first quartile.
• The IQR measures how spread out the middle 50% of the data is.
• It is less affected by outliers, which helps give a clearer picture of where most data points are.

So, while both measures help us see the spread of data, the range can be swayed by extreme values, while the IQR focuses more on the central part of the data.