Standard error of the sample mean is calculated dividing the the sample estimate of population standard deviation ("sample standard deviation") by the square root of sample size.
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The standard error of the underlying distribution, the method of selecting the sample from which the mean is derived, the size of the sample.
The standard error increases.
the sample mean is used to derive the significance level.
It means theres a high amount of variation between the results used to calculate the mean value for a particular sample or experiment
The sample standard deviation (s) divided by the square root of the number of observations in the sample (n).