A sample of 200 elements from a population with a known standard deviation is selected. For an interval estimation of $\mu$, 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 population standard deviation is known, we can use the normal distribution for interval estimation. The t-distribution would be used if the population standard deviation was unknown and the sample size was less than 30, but with a sample size of 200, the normal distribution can be used.

A Sample of 200 Elements from a Population with a Known