An article in the 1993 volume of theTransactions of the American Fisheries Societyreports the results of a study to investigate the mercury contamination in largemouth bass. A sample of fish was selected from 53 Florida lakes and mercury contamination in the muscle tissue was measured (ppm). The mean concentration of this sample was .5250 while the sample standard deviation was .3486. Construct 90% and 95% confidence intervals for.