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5) Lec-RMMeasurement2.docx

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Psychology 2810
Doug Hazlewood

Measurement 2 Reliability and Validity The Problem of Random and Systematic ErrorPrologueMeasuring your height 165 cm accurate MaybeThere could be a random error in the measure misread the number You were slouching Systematic error or bias was everyone wearing shoes when measuredObserved ScoreTrue ScoreRandom ErrorORSystematic Error or bias We must minimize random error and systematic error so observed scoretrue score But howBy maximizing the reliability and validity of measuresPart 1 Reliability Minimizing Random Error A The more is better rule random error will cancel out over repeated measurements Example 1 Beating Vince Carter in basketball Playing 1 on 1we start with the ball You can choose to either play whoever gets to 20 baskets first or whoever gets the first basket wins We can take advantage of random error to our advantage to win the basketball match in this situation However if we were to choose playing 20 baskets it would be very unlikely to get lucky getting
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