To find out whether a new serum will arrest leukemia, 9 mice, which have all reached an advanced stage of the disease, are selected. Five mice receive the treatment and 4 do not. The survival times in years from the time the experiment commenced are as follows: 5.3 0.9 Treatment 2.1 1.4 4.6 No Treatment 1.9 0.5 2.8 3.1 Assume equal variances. Can we conclude that the serum is effective at 0.05 level of significance?

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