A study published by E. Anionwu et al. in the British Medical Journal (Vol. 282, pp. 283-286) examined the steady-state hemoglobin levels of patients with three different types of sickle cell disease: HB SC, HB SS, and HB ST. Use the preceding boxplots to compare the hemoglobin levels for the three groups of patients, paying special attention to center and variation.

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