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Measurement: Reliability and Validity

1 Reliability & Validity -1 Measurement: Reliability and ValidityY520 Strategies for Educational InquiryRobert S MichaelReliability & Validity -2 Introduction: Reliability & Validity All measurements, especially measurements of behaviors, opinions, and constructs, are subject to fluctuations (error) that can affect the measurement s Reliability and Validity . Reliabilityrefers to consistencyor stabilityof measurement . Can our measure or other form of observation be confirmed by further measurements or observations? If you measure the same thing would you get the same score?

4 Reliability & Validity-7 Internal Consistency: Homogeneity Is a measure of how well related, but different, items all measure the same thing. Is applied to groups of items thought to measure different aspects of the same concept. A single item taps only one aspect of a concept. If several different items are used to gain information

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