Hi Sam,

The Columns I called Differentials is based on the Average Delta. they are the difference between the Delta instance and the average Delta. The fact that the average Differential was 0 in both cases I calculated makes me think there is a correction mechanism somewhere.

In any case, during the short run, the Max Delta was l0.67ms, averaging 0.30ms, and during the long run was 6.8ms, averaging 5.0ms

Isn't Statistical Variance the same as what I call Differential?
Your calculation of average differential will always give zero as the outcome, whatever set of sample numbers you use. This is because in F11 you have got the average of column E, in column G you have subtracted each value in column E from the average in F11. Then in F14 you have averaged column G. By definition of "average" this will always be zero.
This is why statisticians use "standard Deviation" as the measure of Statistical variance, because it measures the deviation from the average regardless of the sign of the deviation. There is a EXCEL function for this ( 4 of them actually) change the equation in F14 to:
=STDEV(G11,G65526)