To nd 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 provided. At the 0.01 level of significance, can the serum be said to be effective? Assume the populations to be normally distributed with equal variances. Click here to view the survival times. Click here to view page 1 of the table of critical values of the tdistribution. Click here to view page 2 of the table of critical values of the tdistribution. 2.998 I C- t> ort