34. In a 1943 experiment (Whitlock and Bliss, “A Bioassay Technique for Antihelminthics,”

Journal of Parasitology, 29, pp. 48–58) 10 albino rats were used to study the effectiveness of carbon tetrachloride as a treatment for worms. Each rat received an injection of worm larvae. After 8 days, the rats were randomly divided into two groups of 5 each; each rat in the first group received a dose of

.032 cc of carbon tetrachloride, whereas the dosage for each rat in the second group was .063 cc. Two days later the rats were killed, and the number of adult worms in each rat was determined. The numbers detected in the group receiving the .032 dosage were

for those receiving the .063 dosage. Do the data prove that the larger dosage is more effective than the smaller?

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whereas they were 421,462, 400, 378, 413 207, 17, 412, 74, 116