The average generation times for four different strains of influenza virus were determined using six cultures for each strain. The data are summarized in the following table.

a. Test whether the true mean generation time differs among the four strains.
b. What is the appropriate ANOVA table for these data?
c. Use the Tukey€”Kramer multiple-comparison procedure to identify where any differences occur among the means. (Use α = .05.)

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Statistic Strain A Strain B Strain C Strain D 420.3 450.8 540.4 31.08 330.7 30.22 28.90 33.29