Question

How to calculat Pooled MEean and Standard Deviation?

Answer 1

@Satellite73 @UnkleRhakus test

Answer 2

The pooled standard deviation is the average spread of all data points about their group mean. Pooled mean and standard deviation can be calculated by using below formulas:

Let N be the sample size of i number of groups, M is the mean of group i and sd_i the standard deviation of group i, then the mean of the combined group is estimated as
(Sum NM)/(Sum N)
and the standard deviation of the group is estimated as
sd_i = sqrt[(Sum((N-1)sd_i^2 / ((sum N) - T)]
Where T is the number of participated groups.

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