The t test should be used instead of the z distribution to test the difference between two means when
A) the size of the population is difficult to estimate.
B) the scores of the two samples are correlated.
C) N is less than 30.
D) very large samples are studied.

Question

Quizplus · Accepted Answer

The t-test is more appropriate than the z-test when the sample size is small (N < 30) because it accounts for the increased variability that tends to occur in smaller samples, making it a more accurate tool for hypothesis testing in these conditions.

The T Test Should Be Used Instead of the Z