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What is the pooled standard deviation? What degree of freedom are used in doing inferences for these means and differences in means ? Consider the

What is the pooled standard deviation? What degree of freedom are used in doing inferences for these means and differences in means ?

Consider the data with analysis shown in the following computer output: Level N Mean StDev A 5 9.900 2.907 B 5 16.800 2.168 C 5 10.800 2.387 Source DF SS MS F P Groups 2 140.70 70.35 11.20 0.002 Error 12 75.39 6.28 Total 14 216.09

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