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The most commonly used coefficient for measuring the internal consistency reliability of tests with varying score points (like rating scales or essays) is:

A) Pearson's r
B) Cronbach's Alpha ($\alpha$)
C) KR-20
D) t-test

Correct Answer: B) Cronbach's Alpha ($\alpha$)

Cronbach's Alpha is a generalization of the KR-20 formula and is used when item scoring is continuous or has multiple categories (not just right/wrong).

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