The comptroller of a company is interested in determining whether the average length of long-distance calls by managers varies according to type of telephone. A randomized block design experiment is set up in which a long-distance call by each of five managers is sampled for four different types of telephones: cellular, computer, regular, and cordless. The treatment is type of telephone and the blocks are the managers. The results of analysis by Excel are shown here. Discuss the results and any implications they might have for thecompany.

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Anova: Two-Factor Without Replication ANOVA Source of Variation F PvalueF df MS 4 3 3.5348 15.89 0.00018 3.49 12 0.2225 19 F crit 2.8336 12.74 0.00028 3.26 Managers Phone Type Error Total 11.3346 10.6043 2.6696 24.6085