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The Standard Deviation :: Measuring the Average Distance to the Mean
Things to remember:
The
range
is the maximum minus the minimum value.
You can't just take the average distance to the mean: negatives and positives cancel each other out.
Converting the negatives to positives and then taking the average is the MAD:
mean absolute deviation
not used frequently.
Squaring the distances to the mean then taking the average provides the
variance.
An important measure used often, just not easy to interpret.
Taking the square root of the variance provides the
standard deviation
.
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October 25, 2017  Gerald wrote:
overall a very good lesson and well produced video
May 13, 2014  Larry Chuck wrote:
Wut?
September 3, 2010  Tom wrote:
Flash movie is not playing for me. :(
June 8, 2009  ashish jain wrote:
amazing amazing
May 5, 2009  Stephanie Christians wrote:
Woohoo! I now finally understand the difference b/t the variance and the standard deviation! Thank you!