Single Factor Designs

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which test? Within Subjects Between Subjects matching 2 levels 3 or more levels 2 levels 3 or more levels dependent Repeated independent independent groups measures groups groups tt-test test ANOVA tt-test test ANOVA
IVs (between, within, manipulated), DVs, design, scale (nominal, ordinal, interval, ratio), presentation (table, graph), analysis • College students in a cognitive mapping study are asked to use a direction finder to point accurately to three unseen locations that differ in distance form the laboratory laboratory. One is a nearby campus location, one is a nearby city, and the third is a distant city. • Three groups of preschoolers (50 per group, assigned randomly) are iin a study t d of f ttask k perseverance in i which hi h ddelay l of f reward d is i varied. i d The children in all three groups are given a difficult puzzle and told to work on it as along as they would like. One groups is told that they will receive a chocolate bar at the end of the session if they complete l t the th puzzle. l Th The second d group will ill get t a chocolate h l t bbar after ft 20 minutes from the end of the session, and the third will get the chocolate after 40 minutes. • To examine whether crowding affects problem-solving performance, participants are placed in either a large or a small room while attempting to solve a set of word puzzles. Before assigning participants to the two conditions conditions, the researcher takes a measure of their verbal intelligence to ensure that the average verbal IQ of the groups is equivalent.
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Page 9: Control group designs - Placebo con

Single Factor Designs

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