# Interactive video lesson plan for: Measures of statistical variation: a beginner lesson - 6th/7th grade math

#### Activity overview:

A lesson for 6th or 7th grade math where I explain how to calculate these common measures of variation: range, interquartile range, and the mean absolute deviation, using quiz results as example data. This lesson works as a beginner lesson on these concepts for anyone.

The interquartile range is calculated as the difference between the third and first quartiles, and is typically used when median is chosen as the measure of center.

Calculating the mean absolute deviation takes more work. First, you calculate the absolute deviation (difference) between each data value and the mean, and then take the mean of those. It tells us how far from the mean the individual data values are, on average. It can be used as a measure of variation when mean has been chosen for the measure of center.

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Play this activity

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

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