the test itself.
Student-Related Reliability
He most common learner-related issue in reliability is caused by temporary illness, fatigue,
a “bad day,” anxiety, and other physical or psychological factors, which may make an
“observed” score deviate from one’s “true” score. Also included in this category are such
factors as a test-taker’s “test-wiseness” or strategies for efficient test taking (Mousavi,
2002, p. 804).
Test Reliability
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Sometimes the nature of the test itself can cause measurement errors. If a test is too long,
test-takers may become fatigued by the time they reach the later items and hastily respond
incorrectly. Timed tests may discriminate against students who do not perform well on a
test with a time limit. We all know people (and you may be include in this category1) who
“know” the course material perfectly but who are adversely affected by the presence of a
clock ticking away. Poorly written test items (that are ambiguous or that have more than
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