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What is the pooled deviation? What degrees of freedom are being used in doing inferences for these means and differences in means? Consider the data

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

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Consider the data with analysis shown in the following computer output: Level N Mean StDev A 5 87.623 4.972 B 5 76.167 6.555 C 7 80.000 9.230 D 7 69.333 6.154 Source DF SS MS F P Groups 3 1039.85 346.62 6.87 0.002 Error 20 1009.14 50.46 Total 23 2048.99

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