Operational Definitions,

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Presentation transcript:

Operational Definitions, Variables, Operational Definitions, & Measurement Levels

Variables Variable – An entity that can assume different values. Dependent Variable – What we measure. Independent Variable – The variable whose effect we seek to know. This is often the variable that the experimenter manipulates.

Operational Definitions Operational Definition – A statement that specifies the procedures (the “operations”) used to measure a variable. http://en.wikipedia.org/wiki/Operational_definition Practice: Operationally define… Depression Physical Attractiveness Intelligence

Operational Definitions https://commons.wikimedia.org/wiki/File:Chimpanzee_and_stick.jpg

Levels of Measurement Nominal (categorical) Scale least precise Ordinal (rank) Scale Interval Scale Ratio Scale most precise http://en.wikipedia.org/wiki/Level_of_measurement

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