Refer to Exercise 11.46. The means of two of the factor level combinations-say, A1B1 and A2B1 - are 1 = 8.3 and 2 = 6.3, respectively. Find a 95% confidence interval for the difference between the two corresponding population means.
In Exercise 11.46.

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Source df SS MS F 2 5.3 3 9.1 12 24.5 Total 23 43.7