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A pooled variance is an estimate of population variance obtained from two sample variances when it is assumed that the two samples come from population with the same population standard deviation. In that situation, none of the sample variances is a better estimate than the other, and the two sample variances provided are “pooled” together ... If the sample size is relatively large (e.g., greater than 10-15), the sample standard deviation (s, sigma or s) is a more efficient indicator of process variability. It is typically more difficult to calculate and is less sensitive in detecting special causes of variation that cause only a single value in a subgroup to be unusual. Dec 02, 2015 · Step 5 - Finally, we'll find the variance. (Make sure to -1 from the sample size.) #s^2 = (21.2)/(5-1)# #s^2 = 5.3# An extra, if you'd care to expand - from this point, if you take the square root of the variance, you'll get the standard deviation (a measure of how spread out your terms are from the mean). I hope this helps.