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    Dividing means and their SD to give confidence limits

    Hi all, I am trying to solve the following elementary stats question, but am not sure how: "10 values were taken to calculate the mean of 'A', and 10 separate values were taken to calculate the mean of 'B': mean A = 73.5 (standard deviation 6.3) mean B = 12.7 (standard deviation 2.7)...