When does the standard error of the mean decrease?

1 Answer
VSH
Dec 3, 2017

To decrease standard error, we need to draw larger sample size.

Explanation:

Standard deviation of Sample mean or Standard error:

SE=σ¯x=σ√n

As we see, the standard error decreases if either population standard deviation is small (σ), or sample size is large (n). In general, we have no control over σ, so to decrease standard error, we need to increase the sample size (n)

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