To find out whether a new serum will arrest leukemia, 9 patients, who have all reached an advanced stage of the disease, are selected. Five patients receive the treatment and four do not. The survival times, in years, from the time the experiment; commenced are Use the rank-sum lest, at the 0.05 level of significance, to determine if the: serum iseffective.

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Treatment 5.3 1,1 0.9 2.1 4.6 2.8 3.1 0.5 No treatment 1.9