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Unformatted text preview: he above test are t critical = ± 2.797 13)Given the test statistic and critical values you found above, what should we conclude about the effect of the treatment? 1. Reject the null hypothesis. We conclude that there really is an effect of treatment. 2. Fail to reject the null hypothesis. We conclude that there is not sufficient evidence to say that there is an effect of this treatment. tobserved > tcritical, 3.75  > 2.797, Reject Null Hypothesis Additionally FYI: Compute the estimate of Cohen’s d to measure the size of the preschool effect. X!µ
6
est Cohen's d =
, est Cohen's d =
, est Cohen's d = 0.75, 2
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Reporting: The effect of day care on children’s mathematical ability was investigated. Participation in day care statistically significantly improved scores on a standardized mathematics test, t(24)=3.75, p < 0.01, d = 0.75. 14)In a two
sample study, one sample ha...
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This note was uploaded on 02/17/2013 for the course PSYC 60 taught by Professor Ard during the Fall '08 term at UCSD.
 Fall '08
 Ard
 Psychology

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