2_DefScalGraph - _ Slide 1 _ Definitions, Scaling & Graphs...

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Slide 1 Definitions, Scaling & Graphs ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 2 I. Definitions • Variable – something that can take on more than one value • Independent variable – explains or causes • Dependent variable explained or effect ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 3 Examples of Variables •E x a m p l e –S ex –E y e c o l o r – Class standing –A g e –H e i g h t –W e i g h t –V i s u a l i z a t i o n –SAT -V e rb a l –C u r i o s i t y • 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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Slide 4 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. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 5 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. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Slide 6 Continuous vs. Discrete Vbls (Important in math/stat) • Continuous (real) • Infinitely divisible –T ime ( sec s ) –We igh t ( lb s ) –He t ( inche s ) •D i s c r e t e (integer) •O n l y wh o l e numbers
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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 - _ Slide 1 _ Definitions, Scaling & Graphs...

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