When the population is normally distributed and the population standard deviation $\sigma$
is unknown,then for any sample size n,the confidence interval for $\mu$
is based on the z distribution.

Question

When the population is normally distributed and the population standard deviation $\sigma$ 
is unknown,then for any sample size n,the confidence interval for $\mu$ 
is based on the z distribution.

Quizplus · Accepted Answer

When the population standard deviation $\sigma$ is unknown, the confidence interval for $\mu$ is based on the t-distribution, not the z-distribution, regardless of the sample size $n$.

When the Population Is Normally Distributed and the Population Standard σ\sigmaσ

When the Population Is Normally Distributed and the Population Standard $\sigma$