Why are t statistics more variable than z-scores.
A)The extra variability is caused by variations in the sample mean.
B)The extra variability is caused by variations in the sample variance.
C)The extra variability is caused by variations in the df value.
D)Non of the other options explains the extra variability for t statistics.

Question

Quizplus · Accepted Answer

The extra variability in t statistics compared to z-scores is primarily due to the fact that t statistics incorporate the sample variance, which can vary from sample to sample, whereas z-scores use the population variance, which is constant.

Why Are T Statistics More Variable Than Z-Scores