To calculate the confidence interval based on sample means, you need all but which of the following________.
A) sample mean.
B) Z score determined by alpha level.
C) standard error of the mean.
D) standard deviation of the population.

Question

Quizplus · Accepted Answer

To calculate the confidence interval based on sample means, you need the sample mean, the Z score determined by alpha level, and the standard error of the mean. The standard deviation of the population is not needed, as it is often unknown and estimated by the sample standard deviation.

To Calculate the Confidence Interval Based on Sample Means, You