Chapter 8, Section 2, Exercise 039 Consider the data with analysis shown in the

Question

Chapter 8, Section 2, Exercise 039 Consider the data with analysis shown in the following computer output: Level N Mean StDev A 6 85.404 4.998 B 5 76.167 6.555 C 6 80.000 9.230 D 7 69.333 6.154 Source DF SS MS F P Groups 3 1126.36 375.45 6.64 0.003 Error 20 1130.22 56.51 Total 23 2256.58 What is the pooled standard deviation? What degrees of freedom are used in doing inferences for these means and differences in means? Round your answer for the pooled standard deviation to two decimal places. The pooled standard deviation is . degrees of freedomequals

Explanation / Answer

here pooled std deviation for abve inference is =(MSE)1/2 =(56.51)1/2 =7.5173

and degrees of freedomequals =degree of freedom of error =20

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