Question: 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

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.

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

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