Sickle Cell Disease. 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 following boxplots to compare the hemoglobin levels for the three groups of patients, paying special attention to center and variation. Hemoglobin level 7

9 8

11 10 13 12 14 HB SC HB SS Type HB ST Working with Large Data Sets In Exercises 3.182–3.187, use the technology of your choice to

a. obtain and interpret the quartiles.

b. determine and interpret the interquartile range.

c. find and interpret the five-number summary.

d. identify potential outliers, if any.

e. obtain and interpret a boxplot.