2. One-hundred random mud samples were taken from a lake bottom in order to determine whether two species of the genus Stylaria are associated, that is, tend to occur together. Stylaria are oligochacte worms related to earthworms. Analyze the results below to determine if a significant association between these two species exists. Species B Present Absent Total Species A Present 50 10 60 Absent 25 15 40 Total 75 25 100