Chapter 8, Section 2, Exercise 042 Consider the data with analysis shown in the following computer...
Level N Mean StDev A 6 10.300 2.700 B 5 16.800 2.168 C 4 10.800 2.387 Source DF SS MS F P Groups 2 132.92, 66.46, 11.02 0.002 Error 12 72.34 6.03 Total 14 205.26 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 =
Consider the data with analysis shown in the following computer output: Level N Mean StDev A 4 10.000 3.159 B 5 16.800 2.168 C 6 10.800 2.387 Source DF SS MS F P Groups 2 134.72 67.36 10.46 0.002 Error 12 77.23 6.44 Total 14 211.95 Is there sufficient evidence of a difference in the population means of the three groups? Yes No
ES Consider the data with analysis shown in the following computer output: Mean StDev 6 9.900 2.475 5 16.800 2.168 4 10.800 2.387 Source DF SS MS 2 139.86 69.93 10.74 0.002 Groups 12 78.12 6.51 Error 14 217.98 Total Is there sufficient evidence of a difference in the population means of the three groups?
5. Consider the data with analysis shown in the following computer output: Level N Mean StDev A 4 10.400 2.668 B 5 16.800 2.168 C 6 10.800 2.387 Source DF SS MS F P Groups 2 126.88 63.44 11.09 0.002 Error 12 68.64 5.72 Total 14 195.52 Find a 95% confidence interval for the mean of population A. Round your answers to two decimal places.