The fact that the length of a test influences the size of the reliability coefficient is based on which theory of measurement?
A) classical test theory (CTT)
B) generalizability theory
C) domain sampling theory
D) item response theory (IRT)

Question

Quizplus · Accepted Answer

According to classical test theory, the reliability coefficient of a test is influenced by the length of the test. The longer the test, the higher the reliability coefficient is likely to be, due to the greater opportunity for items to measure the same construct and cancel out errors. Therefore, choice A is the correct answer. The other theories listed (generalizability theory, domain sampling theory, and item response theory) do not directly address the influence of test length on reliability coefficients in the same way as classical test theory.

The Fact That the Length of a Test Influences the Size