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In a study comparing two groups on their test scores, the standard deviation of the comparison distribution (the distribution of mean differences) turned out to be .9, while the mean score of group 1 was 5 and the mean score for group 2 was 7.5. What is the t statistic? a- -8.33 b- -2.78 c- -2.5 d –5.56

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In a study comparing two groups on their test scores, the standard deviation of

the comparison distribution (the distribution of mean differences)turned out to be .9, while the mean score of group 1 was 5 and the mean score for group 2 was 7.5. What is the t statistic?

a- -8.33

b- -2.78

c- -2.5

d –5.56

 
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