An arithmetic test is given twice within a few days to a student. The highest possible score is 40. He receives a score of 35 the first time and a score of 18 the second time. If similarly varying results are obtained with other students, the test is probably:
A) lacking in relevance
B) not sufficiently comprehensive
C) too difficult
D) unreliable

Question

Quizplus · Accepted Answer

The significant variation in scores for the same student indicates inconsistency in performance, suggesting the test is unreliable as it does not consistently measure what it is supposed to measure across different administrations.

An Arithmetic Test Is Given Twice Within a Few Days