Are different species of mosquitoes attracted differently to the two sexes? A study was conducted where three closely related species of mosquitoes were presented with an arm from a human male and an arm from a human female, and the selection was recorded. The two-way table of counts follows.

	Female	Male
Species A	248	66
Species B	514	105
Species C	351	225

A. What proportion of mosquitoes of Species A chose the male arm?

B. The expected number of mosquitoes of Species A who prefer male arms under the null hypothesis is approximately...?

C. What is the null hypothesis of interest?

- Mosquitoes prefer female arms.

- The proportion of mosquitoes that prefer female arms is higher than the proportion that prefer male arms.

- There is no association between the species of mosquito and the arm (sex) selected.

- The proportions of mosquitoes in the three species are equal.