When using a z-test for comparing a sample mean against a standard,one must consider all of the following EXCEPT whether the
A)variance of the variable in the population is known or unknown.
B)distribution of the variable in the population is normal (or at least symmetrical)or asymmetrical.
C)mean falls within an acceptable confidence interval.
D)sample size is small or large.
E)All of the above must be considered.

Question

Quizplus · Accepted Answer

The other options are all considerations when using a z-test. However, whether the mean falls within an acceptable confidence interval is not a consideration for the z-test itself, but rather a decision made by the researcher based on the level of confidence desired for the hypothesis test.

When Using a Z-Test for Comparing a Sample Mean Against