A hospital has k = 4 clinics where it can send blood samples for adhesion measurements of sickle red blood cells to endothelium layers. A hospital administrator decides to perform a randomized block experiment to investigate the consistency between the four clinics. A set of b = 12 blood samples is split into four parts, which are randomly sent to the four clinics. The numbers of adherent cells per square mm of endothelial monolayer reported by the clinics are given in DS 11.4.5. Are any of the clinics suspiciously different from the other clinics? Use a computer package to obtain a graphical presentation of the data set and to help you with the analysis.