When calculating a confidence interval for the mean using a sample size of 30 or more with a known population standard deviation, the _______ is used.
A)Poisson distribution
B)normal distribution
C)Student's t-distribution
D)binomial distribution

Question

Quizplus · Accepted Answer

The normal distribution is used when calculating a confidence interval for the mean with a sample size of 30 or more and a known population standard deviation, according to the Central Limit Theorem.

When Calculating a Confidence Interval for the Mean Using a Sample