15. A sophomore biology student investigating mosquito fish analyzed the frequency of three food items in the stomach contents of the fish. The results are found below. Do males and females differ with respect to food items utilized? Snails Cladocerans Larvae Total Males 50 24 16 90 Females 10 13 61 84 Total 60 37 77 174 16. Why do we use the Fisher exact probability test? 17. Using the following graph, answer the questions below: 0.6 (X) 02 a. Which of the graphs have similar means? b. Which of the graphs has the smallest variance? c. Which of the graphs has the smallest mean value? d. Which of the graphs has the largest variance