5. An observed score
consists of a true score
and error score
Relationship between
true and error scores

6. Parallel Test
Both true scores
are equal
Two test are measures of the
same ability
Both error
variances are equal
Reliability as the correlation
between parallel test

8. Internal
Consistency
The consistency of results across
items on the same test. the two
questions are similar and designed
to measure the same thing

9. Rater
Consistency
Split-half
estimate
Coefficient
Alpha
Kuder-Richardson
reliability
coefficients

10. Stability
The test-retest
approach
Stability of the
test scores over
time
We administer the test
twice to the same groups
of individual

11. Giving a test by using
alternate forms of a
test but have the same
meaning
The same difficulty
level and similar
standard deviations