To find out whether a new serum will arrest leukemia,
99
mice, all with an advanced stage of the disease, are selected.
FiveFive
mice receive the treatment and
44
do not. Survival times, in years, from the time the experiment commenced are provided. At the
0.050.05
level of significance, can the serum be said to be effective? Assume the populations to be normally distributed with equal variances.