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PSYC 226 Ch 3, 1.27.12

PSYC 226 Ch 3, 1.27.12 - Chapter3 PSYC226...

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Chapter 3 PSYC 226
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Principles of measurement Constructs and operational definitions Validity and reliability Scales of measurement Modalities of measurement
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There is NOT always a one-to-one  relationship between your variable and the  measure There are MANY ways to measure a variable
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Theories are the foundation of a scientific  study All good science is theory-based
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Theories are statements about the  mechanisms underlying a behavior:  Organize our thinking about behavior Make predictions about a behavior Provides a framework for our study Guides our interpretation and application of  results Often contain hypothetical or intangible ideas Example: stress affects task performance
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Constructs are derived from theories Definition: a hypothetical attribute or  mechanism that helps explain and predict  behavior in a theory
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