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# Method for Estimating Reliability and Substantiating Validity

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1. Provide a description of one method for estimating the reliability and one method for substantiating the validity of a test.

2. Discuss the conditions under which each method is appropriate and/or inappropriate.

3. Explain the importance of reliability and validity.

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The solution provides a description of one method for estimating the reliability and one method for substantiating the validity of a test.

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RESPONSE:

1. A description of one method for estimating the reliability and one method for substantiating the validity of a test. Discuss the conditions under which each method is appropriate and/or inappropriate.

Validity

Validity can be defined "as the degree to which a test measures what it is supposed to measure. There are three basic approaches to the validity of tests and measures....These are content validity, construct validity, and criterion-related validity." http://www.okstate.edu/ag/agedcm4h/academic/aged5980a/5980/newpage18.htm) In short, Were we right?

(a) Construct Validity Method

To determine construct validity, convergent and divergent validity must be established. First, data concerning the trait being measured is gathered and compared with data from the test being assessed. The data from other similar sources should be similar or convergent. If convergence exists, construct validity is supported. After establishing convergence, then the discriminate validity of the test must be determined that involves demonstrating that the construct can be differentiated from other constructs that may be somewhat similar. In other words, the researcher ...

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