Two tests were given to students in the sixth grade. Test A contained 25 items and was given to a group of low-achieving sixth graders. Test B contained 50 items and was given to the other sixth-grade students in the school who were of mixed ability. Which test would most likely have a higher reliability coefficient and why?
a) Test A, because the test was shorter and was administered to a homogeneous group of students.
b) Test A, because it was given before Test B and might have influenced the scores on Test B.
c) Test B, because the test was longer and was administered to a heterogeneous group of students.
d) Test B, because the test was taken by a group of students who would perform better on the test than those who took Test A.
c
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