When you're trying to decide between standard deviation, range, and interquartile range (IQR), here are some things to think about:

1. Standard Deviation:

   • This works best for data that is pretty evenly spread out.
   • It shows how far away the numbers are from the average (mean).
   • It's helpful if you want to see how much the numbers vary or stay the same.

2. Range:

   • This is super simple and fast to figure out.
   • It gives you a basic idea of how spread out the numbers are, but it can be messed up by extreme values, also known as outliers.

3. Interquartile Range (IQR):

   • This one is not affected much by outliers.
   • It’s great when you want to look at the middle 50% of your data.

Pick the one that helps you look at the parts of your data that matter most!