In order to ensure that a proper sample size is employed for confidence intervals,it would be best to ________.
A)take an initial sample to estimate the population mean and then use that to estimate the best sample size
B)take an initial sample to estimate the population standard deviation and use that estimate to determine the required sample size
C)double the sample size that was originally proposed
D)always use a sample size of 30

Question

Quizplus · Accepted Answer

Taking an initial sample to estimate the population standard deviation and then using that estimate to determine the required sample size is a common and effective approach. This is because the sample size needed for a confidence interval depends on the desired confidence level, the width of the interval, and the variability of the population, which is often estimated through the standard deviation.

In Order to Ensure That a Proper Sample Size Is