Question

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.

Short answer

The variation of hemoglobin levels of HB SC and HB SS is less than that of HB ST.

Step-by-step solution

Given information

We need to find out the comparison of the hemoglobin levels for the three groups of patients, paying special attention to center and variation.

Explanation

The boxplot whiskers are of low and high value. The box starts at the lower quartile, finishes at the upper quartile, and has a straight line at the median.

Because their median is greater than that of HBSS patients, HB SC and HB ST patients have higher hemoglobin levels than HBSS patients.

Because the boxplot of the HB ST patent is wider than the boxplots of the HB SC and HB SS patients, the hemoglobin level of the HB ST patent is higher than the hemoglobin level of the HB SC and HB SS patients.