Question

DO PART F ONLY

19. A wildlife biologist traps and kills 100 adult pythons in the Florida everglades. For each individual, he records it sex and and whether there are any intestinal helminth parasites. He obtains the following results: helminth parasites present helminth parasites absent Males 20 25 Females 40 15 a. Based on these results, estimate the joint probability of catching a male python with helminth parasites. (1 mark) Estimate the conditional probability of finding helminth parasites, given that one has caught a female python. C. (1 mark) Test whether there is an association between sex and parasitism. (2 marks) The hypothesized sex ratio of male to female pythons is 1:1. Test whether the observed numbers of males and females in the sample agree with the numbers expected if the hypothesized sex ratio is correct. e. individual, regardless of sex, is a Poisson-distributed random variable with mean 3. If this is correct, what are the probabilities that there will be (i) no parasites present in an individual, and (ii) at least one parasite present in an individual? f. appropriate hypothesis. (2 marks) Other research hypothesizes that the number of helminth parasites within each (2 marks) Test whether the data obtained allow us to retain the Poisson distribution as an (2 marks)

Answer 1