At a given sample size and level of confidence, the smaller the population standard deviation$\sigma$, the wider and thus the less precise the confidence interval estimate of $\mu$ is.

Question

Quizplus · Accepted Answer

A smaller population standard deviation results in a narrower confidence interval for a given sample size and level of confidence, making the estimate of the population mean (μ) more precise.

At a Given Sample Size and Level of Confidence, the Smaller