The z test assumes that
A) the sample mean is equal to the population mean
B) the standard deviation of the sample scores is equal to the standard deviation of the distribution of sample means is normal
C) the distribution of sample means is normal
D) none of these, since the z test is "assumption free"

Question

Quizplus · Accepted Answer

The z test assumes that the distribution of sample means is normal, which allows for the calculation of a standardized score (z-score) and subsequent determination of the probability of obtaining a sample mean that is unlikely to have occurred by chance alone.

The Z Test Assumes That