To find out whether a new serum would arrest leukemia, 16 patients who had all reached an advantage stage of the disease, were selected. Eight patients received the treatment and eight did not. The survival (in weeks) were taken from the time of experiment was conducted.

Without 1.8 2.9 3.3 3.1 2.4 1.5 1.5 1.6 Treatment With 3.9 4.8 4.7 4.9 4.2 4.5 5.5 4.2 Treatment