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Chapter 8, Section 2, Exercise 047

Consider the data with analysis shown in the following

computer output:

Level N Mean StDev

A 6 85.594 5.383

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 3 908.30 302.77 6.24 0.004

Error 20 969.95 48.50

Total 23 1878.25

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.

Could you please clearly show the pooled standard deviation AND the degrees of freedom.

The pooled standard deviation is=

degrees of freedom=

Thank you!

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