Validity and Reliability

1. Content Validity Knowledge

1.1. Does the test match or fit the instructional objective?

1.2. Yields a logical judgment

1.3. This is the simplest way of deciding whether a test has sufficient validity evidence.

2. Criterion Related Validity Evidence

2.1. Concurrent-related validity evidence

2.1.1. Test scores are measured at the same time.

2.1.2. Yields a numerical value.

2.2. Predictive validity evidence

2.2.1. Refers to how well the test predicts future behavior of examinees.

2.2.2. Test scores are measured after a period of time.

2.2.3. Yields a numerical value.

3. ConstructValidity Evidence

3.1. Tells whether test results correspond with scores on other variables as predicted by some theory.

3.2. This process can be very long and difficult.

4. Test-Retest

4.1. Administering the same test twice to the same group of people.

4.2. The longer the time between test and retest, the lower the reliability coefficient will be.

5. Internal Consistency

5.1. Items should be correlated to each other.

5.1.1. Split halves involves splitting the in half and determining the correlation between the two halves.

5.1.2. Kuder-Richardson method measures the commonality of one form of test to another.

6. Alternate Forms of Equivalence

6.1. Entails administering two alternate forms of tests to the same group of students.

6.2. The time interval is short.