to make your test acceptable--it needs to be valid.

1. By

2. Why evaluate tests?
• To make sure that a test measures the skill,
trait, or attribute it is supposed to measure
• To yield reasonable consistent results for the
same individual
• To measure with reasonable degree of
accuracy

3. A good test must
first of all be valid.

4. • Refers to the extent to which a test
measures what it purports to measure.
• Does the measure what it is suppose to
measure?

5. • CONTENT-RELATED VALIDITY
- the adequacy and representativeness of
learning outcomes to be measured.
- is assessed by systematically comparing a
test item with instructional objectives to see if
they match. Content validity evidence does not
yield a numerical estimate of validity evidence.

6. • CRITERION-RELATED VALIDITY
–Is established by correlating test scores with
an external standard or criterion to obtain a
numerical estimate of validity evidence.

7. 1. Predictive Validity- involves the use of criterion
and a predictor.
- determined by correlating test scores with a
criterion measure collected after a period of time
passed.
2. Concurrent Validity- use the general average of
the students.
- determined by correlating test scores with a
criterion measure collected at the same time.

9. • CONSTRUCT-RELATED VALIDITY
- Refers to how well a performance on a
particular set of tasks or components can be
explained in terms of some psychological
construct or trait.
-determined by finding whether the test
results corresponds with scores on other
variables as predicted by some rationale or
theory.

10. • CONSTRUCT-RELATED VALIDITY
- Refers to how well a performance on a
particular set of tasks or components can be
explained in terms of some psychological
construct or trait.
• DISCRIMANT VALIDITY
- shows a certain psychological test
correlated little or not at all with the construct
under consideration.

11. • The adequacy of validity evidence depends
on both the strength of the validity
coefficient and the purpose the test is being
used for.
• Group variability affects the strength of the
validity coefficient.
• Validity Coefficient should be considered in
terms of the relevance and the reliability of
the criterion or standard.
– A correlation coefficient
Principles In Interpreting Validity