In determining the necessary sample size in making an interval estimate for a population mean,it is necessary to first make an estimate of the population standard deviation.

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In order to calculate the necessary sample size for an interval estimate of the population mean, we need to have an estimate of the population standard deviation. Without a reasonable estimate of the population standard deviation, it may be difficult to determine the appropriate sample size to ensure a certain level of accuracy and confidence in the interval estimate.

In Determining the Necessary Sample Size in Making an Interval