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 these.

Question

Quizplus · Accepted Answer

When the population standard deviation is unknown and the sample size is less than 30, we use the t distribution for constructing confidence intervals for the population mean. Since n = 15, the t distribution is the appropriate choice.

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