Conduct a multiple comparison of means by Tukey’s method to determine exactly where the significant differences occur in Problem 12.

Data From Problem 12

A pediatrician speculated that frequency of visits to her office may be influenced by type  of medical insurance coverage. As an exploratory study, she randomly chose 15 patients: 5  whose parents belong to a health maintenance organization (HMO), 5 whose parents had  traditional medical insurance, and 5 whose parents were uninsured. Using the frequency  of visits per year from the following table, test the null hypothesis that type of insurance  coverage has no effect on frequency of visits.

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HMO 12 6 8 76 Traditional 6 5 7 5 1 None 32531