In a one-way ANOVA with four samples, the sample means were ̄x1 = 86.8,

̄x2 = 82.4, ̄x3 = 85.8, and ̄x4 = 89.1. The sample sizes were n1 = n2 = n3 = n4 = 4, and the error mean square was MSE = 1.3. Perform the Tukey–Kramer test on each pair of means. Which pairs can you conclude to be different? Use the α = 0.01 level.