The pooled standard deviation turns out to be 5.789564. #find sample standard deviation of each sample Suppose we have the following data values for two samples: Method 1: Calculate Pooled Standard Deviation Manually The following examples show two methods for calculating a pooled standard deviation between two groups in R. s 1, s 2: Standard deviation for group 1 and group 2, respectively.n 1, n 2: Sample size for group 1 and group 2, respectively.The formula to calculate a pooled standard deviation for two groups is as follows: In statistics it appears most often in the two sample t-test, which is used to test whether or not the means of two populations are equal. A pooled standard deviation is simply a weighted average of standard deviations from two or more independent groups.
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