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    Estimating the variance of a computation from descriptive statistics

    Hello, I am a Ph.D. candidate in the behavioural sciences and I am a bit at a loss with respect to finding a solution to the problem to follow: I have the means and standard deviations of three time points in a sample of twenty people. Mean (SD) 10.3 (2.4) 9.2 (1.3) 9.5 (1.8) I...