Question

A professor compares scores on a competency exam among students at two times during a single semester.

What type of t test is most appropriate for this study?

Select one:

a. one-sample t test

b. two-independent sample t test

c. dependent samples t test

d. there is not enough information to answer this question.

Answer 1

Here' the answer to the question. Let me know in case you've doubts.

So, the professor evaluates the SAME sample twice on a test.
Hence, there aren't 2 independent samples involved here. Hence, B is wrong.

A is not right because there are 2 tests ( though on the same sample)

Such a test is called a "dependent sample" test because the sample used for tests is the same. In this t-test, "related groups" indicates that the same participants are present in both groups. This test is typically used in cases when repeated measures are taken, or when analyzing similar units/ comparable specimen. We are doing repeated measurs in this case. .

Hence, C is right