Some investigators think that the concentration (mg/mL) of a particular antigen in supernatant fluids could be related to onset of meningitis in infants. The accompanying data are typical of that given in plots in the article “Type-Specific Capsular Antigen Is Associated with Virulence in Late-Onset Group B Streptococcal Type III Disease” (Infection and Immunity [1984]: 124–129). Construct an ANOVA table, and use it to test the null hypothesis of no difference in mean antigen concentrations for the three groups.

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Asymptomatic infants Infants with late onset sepsis Infants with late onset meningitis 1.56 1.06 0.87 1.39 0.71 0.87 1.51 1.78 1.45 1.13 1.87 1.89 1.07 1.72 1.21 1.34 1.95 2.27 0.88 1.67 2.57