Transcription of Chapter 3 Psychometrics: Reliability & Validity
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Chapter 3 Psychometrics: Reliability & Validity
Chapter 3 Psychometrics: Reliability & Validity 45 Measuring Learning & Performance: A Primer | Retrieved from Chapter 3 Psychometrics: Reliability & Validity The purpose of classroom assessment in a physical, virtual, or blended classroom is to measure ( , scale and classify) examinees knowledge, skills, and/or attitudes. For example in achievement testing, one measures, using points, how much knowledge a learner possesses (called scaling) and then his or her total raw point score equates to a grade, , A, B, C, etc. (called classifying). In this Chapter , we will consider essential attributes of any measuring device: Reliability and Validity .
C. Threats to and Techniques for Improving Reliability Indices 1. Threats to Reliability a. Group homogeneity: When a test is given to a very similar (homogeneous) group, the resulting scores are closely clustered and the reliability coefficient will be low. The more heterogeneous the examinee group, the higher the correlation coefficient. b.
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