Students often make a few common mistakes when figuring out range and standard deviation. Here are some of them:

1. Calculating Range Wrong:

   • The range is found by using this formula:
     Range = Maximum - Minimum.
     Sometimes, students forget to subtract these two numbers, or they mix up the maximum and minimum values.

2. Getting Standard Deviation Mixed Up:

   • Standard deviation (we often write it as σ) shows how spread out the data is. A common mistake is thinking it's the same as variance (which is σ²).

3. Overlooking Outliers:

   • Outliers are numbers that are very different from the rest. They can change the results a lot. Students sometimes forget to look for these outliers, which can mess up their calculations.

4. Using the Wrong Formula:

   • If you use the sample standard deviation formula when you should be using the population formula, you might end up with the wrong answers.

By knowing these common mistakes, students can get better at analyzing data accurately.