A sample of 200 elements from a population with a known standard deviation is selected. For an interval estimation of μ, the proper distribution to use is the
A) normal distribution
B) t distribution with 200 degrees of freedom
C) t distribution with 201 degrees of freedom
D) t distribution with 202 degrees of freedom

Question

Quizplus · Accepted Answer

Since the sample size is large (n=200) and the population standard deviation is known, we can use the normal distribution for interval estimation of the population mean. The t distribution is used when the population standard deviation is unknown or when the sample size is small.

A Sample of 200 Elements from a Population with a Known