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134ANotest-TestPrLouie

134ANotest-TestPrLouie - Test of Means t-test Some research...

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Test of Means: t-test Some research questions are answered with rating sca/es, e.9., "How hard do you study?" notveryhard 1 2 3 4 5 veryhard or numbers, e.9,, "How old are yoL)?" Data analysis involves comparing the means across experimental conditions.
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o X,. mean of data in cell 1 Notation: For each cell o xt. data in cell 1 o n t: number of data points in cell 1 o L*i . sum of squares of cell 1 4
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Notation Symbols . lf . total t: obt number of data points in the experiment t-value obtained with data, which is compared to t-value in table . critical t-value in table, which must be exceeded to reject the null hypothesis ot ct'tl o df = Degrees of freedom: ( lf 2) I
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Example. adapted from T. Louie, 1999, Journal of Applied Psychology This research examines if outcome information infl uences what individuals feel they would have pred icted i n foresight.
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A. One group of 10 participants --read that a financial advisor purchased a company's stock --estimated the stock price after one year B. Another group of 12 participants --read that a financial advisor purchased a company's stock --read that the price decreased after a year --estimated what they would have thought the stock price would be after one year had they not heard the stock outcome.
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lndependent variable =
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