When the population is normally distributed,population standard deviation σ is unknown,and the sample size is n = 15,the confidence interval for the population mean μ is based on
A) the z (normal)distribution.
B) the t distribution.
C) the binomial distribution.
D) the Poisson distribution.
E) None of the other choices is correct.

Question

Quizplus · Accepted Answer

When the population standard deviation is unknown and the sample size is small (in this case n = 15), the confidence interval for the population mean is based on the t distribution.

When the Population Is Normally Distributed,population Standard Deviation σ Is