Sickle Cell Disease. A study published by E. Anionwu et al.

in the British Medical Journal (Vol. 282, pp. 283–286) measured the steady-state hemoglobin levels of patients with three different types of sickle cell disease. Following is a stem-and-leaf diagram of the data.

2 7 0 1 1 3 4 4 5 6 7 1 1 1 2 8 0 1 3 4 6 7 9 1 3 5 6 7 8 9 0 0 1 1 3 6 6 3 3 8 9 7

8 9

10 11 12 13