5. [5 marks] A government agency is going to keep records of nitrogen levels in a lake that is mostly surrounded by farm

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5 5 Marks A Government Agency Is Going To Keep Records Of Nitrogen Levels In A Lake That Is Mostly Surrounded By Farm 1 (41.21 KiB) Viewed 19 times

5. [5 marks] A government agency is going to keep records of nitrogen levels in a lake that is mostly surrounded by farmland. High nitrogen levels may indicate incorrect or excessive use of fertilisers. Water samples will be taken at 5 metres depth from 15 locations on the lake and nitrogen concentration will be measured in milligrams per litre of water. There was debate over whether the locations to be sampled should be spread randomly over the lake's surface, or positioned at the mouths of water sources that feed into the lake (e.g., rivers, creeks, gullies). (a) Briefly describe a method by which 15 locations could be selected randomly on the surface of a lake. (Note: when referring to random selection you must describe how you would achieve randomness.] [3] (b) As indicated above, two sampling methods are being considered. Which of these should be preferred if the government agency is primarily concerned with (1) regulating fertiliser use on farms, or [1] (ii) environmental management, including water quality in the lake. [1]