MicroExam 1 solutions

MicroExam 1 solutions - Micro-Exam 1 ESM 206A Fall 2007...

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Micro-Exam 1 ESM 206A Fall 2007 Once you read this file, you may not ask for help from your peers or the instructors, nor may you discuss with them any of the concepts from the first problem set. If you have a question about how to run the software, you may ask your instructors (not your peers). Your solution is due to Heather by 4 PM on Friday, Dec. 7. Please email your answers to her or put a hard copy of your answers in her mailbox. Good luck!
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A couple of years ago a Bren group project did water quality monitoring in the creek that runs through Hope Ranch. The purpose of that project was primarily to characterize the existing conditions and relate them to physical characteristics of the stream. Now the Chairman of the Hope Ranch Association would like to demonstrate that the creek water leaving the development is cleaner than the water entering it. He has sent you a subset of the data from the group project, containing E. coli concentrations in number per 100 ml of water; it is on the course webpage as HopeRanch.xls. The data were collected weekly through the summer and early fall at two sites: the place where the creek enters Hope Range (“Upstream”) and the outlet into the ocean (“Outlet”). Your assignment is to determine whether the data support the hoped-for conclusion. Note: the format of the data file does not provide a clue as to the appropriate test – after all, the Chairman doesn’t know anything about how to run R Commander! Indeed, you may need to reformat the data before you can even read it into the software. 1. Determine appropriate null and alternate hypotheses to make the decision. Explain why you chose these. H0: μ outlet μ upstream ≥ 0 ( μ outlet μ upstream ) OR μ upstream - μ outlet ≤ 0 ( μ upstream μ outlet ) HA: μ outlet μ upstream < 0 ( μ outlet < μ upstream ) OR μ upstream
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MicroExam 1 solutions - Micro-Exam 1 ESM 206A Fall 2007...

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