Use anova (. . . ) to re-compute the mean squares in Table 5.2. Use Bartlett's statistic (Exercise 18.9) to test the hypothesis that the residual mean squares have the same expected value at all time points. What assumptions are needed to justify the null distribution?

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MS 6 12 Host 12 340 190 Aviary 290 204 408 Lineage 83 85 85 Residual 111 52