19. Spivack (A-18) investigated the severity of disease associated with C. difficille in pediatric inpatients. One of the variables they examined was number of days patients experienced diarrhea. The data for the 22 subjects in the study appear below. Compute the mean, median, variance, and standard deviation. 3 11 3 4 14 2 4 5 8 11 2 2 3 2 1 1 7 2 1 1 3 2 SOURCE: Jordan G. Spivack, Stephen C. Eppes, and Joel D. Klien, "Clostridium Difficile Associated Diar- thea in a Pediatric Hospital," Clinical Pediatrics, 12 (2008), 347-852.