A study was conducted to examine the relation between the acidity level and average mercury level in Florida fish. Researchers randomly selected 53 Florida lakes. The researchers tested the water form serval locations to determine the pH level (below 7 is acidic; greater than 7 is basic). Serveral fish were caught in each lake and analyzed for the average mercury levl (mmHg). The date are stored in FloridaLakes. a) what are the cases in this study? b) what kind of sampling did the researcher do? Brief explain. c) What is the explanatory variable? What type of variable is it? Explain. d) What is the response variable? Indetify the variable type. Explain. e) What type of study was conducted? Brief explain. f) Is it appropriate to conclude causation in this case? Explain