Validity and Reliability

1. Concurrent criterion related validity evidences determined by giving both the new test and the established test to a group of respondents then finding the correlation between the two sets of test scores.

2. Criterion-Related Validity Evidence- two types, concurrent and predictive

3. Validity: Does the test measure what it is suppose to measure?

3.1. Types of Validity Evidence

3.2. Content Validity Evidence:Answers the question, does the test measure the instructional objectives?

4. Predictive Validity Evidence refers to how well the test predicts future behavior of people taking the test. This allows teacheres to provide more individualized test if needed for students or allows teachers to change test to meet the needs of their students.

5. Alternate Forms- When there are two different versions of a test they can be used to provide an estimate of the reliability of the scores from the test. The test offers the same material but in a difference sequence.

6. Stibility- The test is given twice to compare if the students can recll the information with no more instruction being given on a subject from on test date to the next. The time that has passed shows reliability if students score is in about the same range.

7. Three ways to estimate the reliability of scores from a test- test -retest ,alternatice form and internal consistency.

8. Reliabilty of a test is the consistency with which it yields the same rank for a person who takes the test more than once. It mesures if true learning has taken place.