As long as the sample is more than one item, the standard error of the sample mean will be smaller than the standard deviation of the population.

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Quizplus · Accepted Answer

This is because the standard error of the sample mean measures the variation or spread of the means of different samples that could be drawn from the same population, while the standard deviation of the population measures the variation or spread of individual values within the population. The more samples we take, the closer the sample mean will be to the population mean, and therefore, the standard error of the sample mean will decrease.

As Long as the Sample Is More Than One Item