Midterm1-spring2001

# Midterm1-spring2001 - Name: Page 1 of 10 Instructions:...

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Name: Page 1 of 10 Instructions: --Write your name on all the pages --Make sure that all 10 pages are attached. --You may not use calculators or other electronic aids. The math needed to solve a problem should be relatively simple. If not please give your answer by showing how you would make the calculation: e.g., showing "(10+10)/4" is as good an answer as "5" (writing down an appropriate equation and clearly defining the variables, as well as indicating their values, if known, will also suffice). --If you get hung up on a problem, skip it; return to it after you&ve answered the ±easy² problems. GENERAL ECOLOGY PCB 4044 SPRING 2001 MIDTERM I PAGE POINTS POSSIBLE SCORE 2 12 _____ 3 13 _____ 4 6 _____ 5 13 _____ 6 13 _____ 7 12 _____ 8 8 _____ 9 10 _____ 10 13 _____ _____ _________ TOTAL 100 _____

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Name: Page 2 of 10 1. (12 points) A plant occurs on several islands off the coast of Florida, but is absent from the mainland. a) List three hypotheses that might explain this pattern (each hypothesis should emphasize a different process). b) For one of these hypotheses (indicate which one), generate a prediction derived from the hypothesis. c) Design an experiment to test this hypothesis. Include all relevant information, including details about the key components of a well designed experiment. Also be sure to mention what you will measure and what you should &see± if your hypothesis is correct (and what you should see if it is incorrect).
Name: Page 3 of 10 2. (7 points) You&re completing the analyses for one of your lab reports. You do a statistical test and report ± P =0.02²; as a result, you reject the null hypothesis. Your room mate (a history major) reads your report, but is unfamiliar with statistics and doesn&t understand what a P-value is. What would you tell him? 3. (6 points ) For each of the following pairs of items, please select (i.e., circle) the study that would have the greatest statistical power. A study with a sample size of 50 replicates vs. A study with a sample size of 10 replicates A study with sample variance of 100 vs. A study with sample variance of 20 A study in which the true difference between treatments is 16 ind./cage vs. A study in which the true difference between treatments is 4 ind./cage

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## Midterm1-spring2001 - Name: Page 1 of 10 Instructions:...

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