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

Question

Quizplus · Accepted Answer

When the sample size is less than 30 and the population standard deviation is unknown, the Student's t-distribution is used to calculate a confidence interval for the mean. This is because the t-distribution accounts for the additional uncertainty introduced by estimating the population standard deviation from the sample.

When Calculating a Confidence Interval for the Mean Using a Sample