The results of an experiment to assess the effect of crude oil on fish parasites are described in the article “Effects of Crude Oils on the Gastrointestinal Parasites of Two Species of Marine Fish” (J. Wildlife Diseases, 1983: 253–258).

Three treatments (corresponding to populations in the procedure described) were compared: (1) no contamination, (2)

contamination by 1-year-old weathered oil, and (3) contamination by new oil. For each treatment condition, a sample of fish was taken, and then each fish was classified as either parasitized or not parasitized. Data compatible with that in the article is given. Does the data indicate that the three treatments differ with respect to the true proportion of parasitized and nonparasitized fish? Test using 
.01.