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The formula to calculate a pooled standard deviation for two groups is as follows: Pooled standard deviation = √ (n1-1)s12 + (n2-1)s22 / (n1+n2-2) where: n1, n2: Sample size for group 1 and group 2, respectively. kereta 2d togel s1, s2: Standard deviation for group 1 and group 2, respectively. pm toto slot Note that the pooled standard deviation should only be used when