Quality Digest, March 5, 2018


Figure 8:  A Simple Histogram



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DJW328.Mar.18.The Empirical Rule

Figure 8:  A Simple Histogram

Of course entropy usually prevents us from getting histograms as simple as Figure 8, but

consider what happens as we move points out of each stack.  For simplicity we shall do this

symmetrically.  If we moved two points out to ± 2.58.  The standard deviation statistic would

increase to s = 1.060.  To get the standard deviation back down to the neighborhood of 1.005 we

would need to also shift some points into the middle.  Four points at zero, six points at ± 0.1, and

two points at ± 0.5 will suffice to bring the standard deviation back down to s = 1.004.  Thus, as

shown in Figure 9, we had to shift twelve points into the middle to compensate for the two points

we moved out into the tails.

 

–3



–2

–1

0



1

2

3



2 points were

moved out

into the

tails


so 12 points 

had to move

into the

center


to keep the standard 

deviation about

the same:

s = 1.004




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