Question 7 of 17 3 -128 Level N Mean StDev A 6 9.800 2.909 B 5 16.800 2.168 C 4 10.800 2.387 Source DF SS MS F P Groups 2 147.67 73.84 11.33 0.002 Error 12 78.21 6.52 Total 14 225.88 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 freedom