To find out whether a new serum will arrest leukemia, 9 mice, all with an advanced stage of the disease, are selected. Five mice receive the treatment and 4 do not. Survival times, in years, from the time the experiment commenced are as follows: At the 0.05 level of significance can the serum be said to be effective? Assume the two distributions to be normally distributed with equalvariances.

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Treatment No Treatment 2.1 5.3 4.6 0.9 1.4 1.9 0.5 2.8 3.1