The more variable that the population measurements are, the larger the sample size that is needed to accurately estimate µ at a specific confidence level.

Name: The more variable that the population measurements are, the larger the sample size that is needed to accurately estimate µ at a specific confidence level.
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If the population has a lot of variation, then you need a larger sample size to get a closer approximation of the population parameter.

The More Variable That the Population Measurements Are, the Larger