New Video: Variation/ Variability/ Dispersion/ Spread

I just uploaded a new video. It is the first in a playlist on the concept variously known as "Variation", "Variability", "Dispersion", "Spread", and "Scatter". It gives an overview of the concept and compares and contrasts several measures of Variation: 

• Range
• Interquartile Range (IQR)
• Variance
• Mean Absolute Deviation (MAD), and
• Standard Deviation

Future additions to the playlist will cover in more detail:

• Sums of Squares
• Variance
• Standard Deviation
• Standard Error

These measures of Variation are for Populations and Samples. In addition, my book covers Variation in Processes, so in the future, there will be a separate playlist on these concepts:

• Statistical Process Control
• Control Charts Part 1
• Control Charts Part 2
• Process Capability Analysis