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Standard Error of the Mean and Standard Error of the Difference

Please give a full explanation of the difference between a standard error of the mean and a standard error of the difference between means.

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The standard error of the mean is the margin or error by which the mean (average) of a number of samples taken from the same population. This error may cause the mean to be slightly off ...

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Please give a full explanation of the difference between a standard error of the mean and a standard error of the difference between means.

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