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# standard deviation of the mean watch

1. we have N repeated measurements x subject to random errors

population variance is

the variance of the mean is

(population variance) / N

what does the variance of the mean represent? and how?
2. Do you know what the difference between a sample mean and a population mean is?

The variance of the sample mean (the formula you have above) is telling you how close the sample mean is to the population mean. So a small variance of the sample mean implies the sample mean is close to the population mean.

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Updated: January 9, 2015
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