(also known as “s.d.” and “Std. Dev.”)
What is a Standard Deviation? …AND… How is this statistic calculated?
Watch the video from Aga Khan Academy which provides a thorough review on how to calculate the Standard Deviation of a population or a sample. The full clip is very useful and informative, however you can go directly to a working example on how to calculate s.d. if you skip ahead to 7min 30s.
Click on the link below – standard deviation in simple terms – very clear explanations on this website: http://www.mathsisfun.com/data/standard-deviation.html
How do we interpret the answer?