2_DefScalGraph - De finitions, S caling & Graphs I . De...

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Definitions, Scaling & Graphs
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I. Definitions Variable – something that can take on more than one value Independent variable – explains or causes Dependent variable explained or effect
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Examples of Variables Example Sex Eye color Class standing Age Height Weight Visualization SAT-Verbal Curiosity Possible values Female, male Blue, brown, green Fr, soph, jr., sr. 6, 19, 25, 70 (years) 60, 72, 84 (inches) 79, 101, 220 (lbs) 1.5, 2.0, 3.0 (secs) 500, 600 (scores) 40, 50, 60 (scores)
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Example Scenarios (1) Student volunteers given ‘study drug.’ Half get mild caffeine, half get saline (nobody knows who gets what). Both take same exam next day. Pilots use microcomputer to train communication skills. Half get to talk to simulated air traffic control while flying micro. Other half plays asteriods. All then fly full motion sim.
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Example Scenarios (2) Study to determine whether SAT verbal scores predict freshman GPAs . Collect SAT scores from entering freshmen, collect GPA at end of first year.
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Continuous vs. Discrete Vbls (Important in math/stat) Continuous (real) Infinitely divisible Time (secs) Weight (lbs) Height (inches) Discrete (integer) Only whole numbers Number of siblings Number of errors in a test Number of bar presses
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Continuous vs. Nominal Vbls
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This note was uploaded on 05/21/2011 for the course PSY 3213 taught by Professor Staff during the Fall '08 term at University of South Florida - Tampa.

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2_DefScalGraph - De finitions, S caling & Graphs I . De...

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