When can the z-test be used in statistical hypothesis testing?
A)When the measure of central tendency used for the raw scores is the median
B)When the raw scores are transformed from a nominal scale to a ratio scale
C)When the raw score population's standard deviation is known
D)When the z-test standard deviation is known

Question

Quizplus · Accepted Answer

The z-test can be used when the standard deviation of the population is known. It is used to test hypotheses about a population mean or proportion when the sample size is sufficiently large. The z-test is not appropriate when the measure of central tendency is the median or when the raw scores are transformed from a nominal scale to a ratio scale. The z-test standard deviation is not a valid concept.

When Can the Z-Test Be Used in Statistical Hypothesis Testing