Consider the data with analysis shown in the following computer output: Level N Mean StDev A 7 86.103 5.188 B 5 76.167 6.555 C 5 80.000 9.230 D 7 69.333 6.154 Source DF 55 MS F P Groups 3 1021.85 340.62 7.56 0.001 Error 20 901.37 45.07 Total 23 1923.22 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 I degrees of freedom - n eTextbook and Media