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Re: ANOVA with Pos hoc comparisons

Posted by David Marso on Oct 05, 2011; 3:54am
URL: http://spssx-discussion.165.s1.nabble.com/ANOVA-with-Pos-hoc-comparisons-tp4871444p4871452.html

Missing info: Sample sizes of each group!!!
Kuan wrote
Hi, I have run a one way analysis of variance using SPSS. The result of this
test was a significant difference among the three groups. The mean scores
and SDs for three groups were 3.74 (0.72) for A group, 3.26 (0.92) for B
group, & 3.25 (0.83) for C group. To determine where significant differences
lie, I performed a post hoc analysis. SPSS showed me that there was a
significant difference between A & B, however, no significant difference
between A & C.
But the mean difference between A & C is larger than the mean difference
between A & B. I wonder why there is no significant difference between A & C?

Any help would be greatly appreciated!

Kuan

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