In this assignment, you will practice reporting and interpreting basic data on a case involving ghrelin and weight loss. Download the handout below to get started. Answer 10 questions in Parts II and III. Include answers to Part IV in your post to earn full credit on this assignment. Making graphs in Excel is suggested, but not required. Scan or take a picture/screenshot of your graphs.
Some helpful tips:
Example of error bars on a line graph (hint: add SE above and below each point):
Independent variable = x-axis
Dependent variable = y-axis
If all else fails, try Google/YouTube for help with graphs.
Attempted assigned questions
Submitted answers to Parts II and III (20 points)
Skipped at least one question (15 points)
Attempted bonus question(s)
Submitted answers to Part IV (5 points)
Did not attempt Part IV (0 points)
Total possible = 25 points
Nitrates are groundwater contaminants derived from fertilizer, septic tank seepage and other sewage, nitrate poisoning is particularly hazardous to infants under the age of 6 months. The Maximum Contaminant Level (MCL) is the highest level of a contaminant the government allows in drinking water. For nitrates, the MCL is 10 mg/L. The health department wants to know what proportion of wells in Madison County that have nitrate levels above the LCL. A worker has been assigned to take a simple random sample of wells in the county, measure the nitrate levels, and assess compliance. What size sample should the health department obtain if the estimate is desired to be within 2 percent with 95% confidence if :
A. There is no prior information available?
B. A study conducted two years ago showed that approximately 7% of the wells in Madison County had nitrate levels exceeding the MCL?