You want to estimate σ for the population of waiting times at McDonald's drive-up windows,
and you want to be 95% confident that the sample standard deviation is with 20% of $\sigma$ . Find
the minimum sample size. Is this sample size practical?

Question

Quizplus · Accepted Answer

The Answer of You want to estimate σ for the population of waiting times at McDonald's drive-up windows,
and you want to be 95% confident that the sample standard deviation is with 20% of $\sigma$ . Find
the minimum sample size. Is this sample size practical?

You Want to Estimate σ for the Population of Waiting σ\sigmaσ

You Want to Estimate σ for the Population of Waiting $\sigma$