Using the data in Exercise 22, perform the Tukey–Kramer test to determine which pairs of means, if any, differ. Use the α = 0.01 level of significance.

Exercise 22

Rapid drainage of floodwater is crucial to prevent damage during heavy rains. Several designs for a drainage canal were considered for a certain city. Each design was tested five times, to determine how long it took to drain the water in a reservoir. The following table presents the drainage times, in minutes.

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Channel Type 2 12345 Drainage Time 41.4 43.4 50.0 41.2 38.7 48.3 51.1 38.3. 32.6 33.7 34.8 22.5 26.3 30.9 33.3 23.8 44.9 47.2 48.5 37.1