Quote:
Originally Posted by piutemike
Just wanted to know how to figure SD. I did not know if there was a simple way of doing that.

Ok, but like offered, it's worthless information with such small samples.
A simple example
Suppose we wished to find the standard deviation of the set of the numbers 4 and 8.
Step 1: find the arithmetic mean (or average) of 4 and 8,
(4 + 8) / 2 = 6.
Step 2: find the deviation of each number from the mean,
4 − 6 = − 2 8 − 6 = 2.
Step 3: square each of the deviations (amplifying larger deviations and making negative values positive),
( − 2)2 = 4
22 = 4.
Step 4: sum the obtained squares (as a first step to obtaining an average),
4 + 4 = 8.
Step 5: divide the sum by the number of values, which here is 2 (giving an average),
8 / 2 = 4.
Step 6: take the nonnegative square root of the quotient (converting squared units back to regular units),
So, the standard deviation of the set is 2.