The parasitic nematode Camallanus oxycephalus infects many freshwater fish, including shad. The following table gives the number of nematodes per fish (Shaw et al. 1998):

a. Produce a graph of the data. What type of graph is most appropriate?

b. Calculate the frequencies expected if nematodes infect fish “at random”

(i.e., independently and with equal probability).

c. Overlay the expected frequencies onto your graph. What are the noticeable differences?

d. Is there evidence that nematodes do not worm their way into the fish at random? Here and always, show all four steps of hypothesis testing.

Transcribed Image Text:

Number of nematodes 00 11 22 33 44 55 66 Number of fish 103103 7272 4444 1414 33 11 11