16. Chemotherapy A study was conducted to determine whether a particular drug injection reduced the harmful effects of a chemotherapy treatment on the survival time for rats. Two randomly selected groups of 12 rats received the toxic drug in a dose large enough to cause death, but in addition, one group received the antitoxin to reduce the toxic effect of the chemotherapy on normal cells. The test was terminated at the end of 20 days, or 480 hours. The survival times for the two groups of rats, to the nearest 4 hours, are shown in the table. Do the data provide sufficient evidence to indicate that rats receiving the antitoxin tend to survive longer after chemotherapy than those not receiving the antitoxin? Use the Wilcoxon rank sum test with a 5.05.

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Chemotherapy Only Chemotherapy Plus Drug 84 140 128 168 92 184 368 96 184 480 92 188 76 480 104 244 72 440 180 380 144 480 120 196