134ANotest-TestPrLouie.pdf

# 134ANotest-TestPrLouie.pdf - Test of Means: t-test Some...

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Unformatted text preview: Test of Means: t-test Some research questions are answered with rating sca/es, e.9., &quot;How hard do you study?&quot; notveryhard 1 2 3 4 5 veryhard or numbers, e.9,, &quot;How old are yoL)?&quot; Data analysis involves comparing the means across experimental conditions. 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 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 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. 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. lndependent variable = the presumed source of differences in the data, which is often manipulated in the study. Example: The stock outcome--or price after one year--is manipurated in the study (i..e., it is provided or not provided)....
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## 134ANotest-TestPrLouie.pdf - Test of Means: t-test Some...

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