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Instructor: Chris Gillen Ryn Edwards Pat Heithaus Wade Powell Jennifer Smith
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1. Which of the following samples would provide the best estimate of the average height of 3 year old pines in Ohio.
a. 1000 3 year old pines measured at the Brown Family Enviornmental Center b. 250 3 year old trees measured at each of 4 pine plantations located in the N,S,E.W sections of Ohio c. 100 3 year old trees measured at each of 10 pine plantations located in Knox County, Ohio d. 1000 3 year old pines measured from 10 different locations throughout Ohio e. all samples would provide equally accurate estimates of the height of 3 year old pines in Ohio
2. Briefly defend your answer to question 1.
3. You have sampled trees from three different populations containing several thousand trees. You discover that all three samples have the same mean and standard deviation. The sample size for the three populations was not the same. For which population has the true mean been most accurately estimated?
Population A, n = 30 Population B, n = 20 Population C, n = 10 All are equally accurate
4. Breifly defend your answer to question 3.
5. Why are error bars added to figures?
Use the graphs below to answer questions 6-9.
6. Which site has the highest variability in apple size? A B C
7. Which curve in the second graph corresponds with the data represented by site A in the first graph? Site 1 Site 2 Site 3 impossible to determine
8. In the frequency distribution of size shown above, which site has the smallest standard deviation? Site 1 Site 2 Site 3 impossible to determine
9. At which site would you find the biggest apple? Site 1 Site 2 Site 3 they are all similar impossible to tell
10. Instead of making a graph you decide to present information on Site B in text form. What three bits of information should you provide?
11. Write one or two sentences that summarize your fiddler crab morphology data, incorporating both the quantitative data and any qualitative observations that you made. Use "+/-" for the plus/minus symbol.