BSC 320 — Principles of Ecology Marshall University — Spring Semester 2010 Lab Assignment #1: Some Cautions Concerning the Statistics Problems Assignment 1. This is NOT a collaborative assignment; it is to be done by you alone, or by you with assistance from me (Dr. May). If you do not understand any aspect of the work, please come to me as far ahead of the due date as possible. I will help you through it, so that I know that you understand what you are doing. 2. In order to receive full credit for this assignment, you will need to demonstrate the logical path by which you arrived at each answer. This will require showing a reasonable number of intermediate steps along the way. For example, in carrying out the t-test, you cannot arrive at a value for tcalc without first calculating the two relevant s2 values, and then sd. Write out the formula for s2 followed by the same formula with values substituted for the variables, and then the final variance. (For the second variance, you need not write out the original formula, but should again write the formula with the appropriate values inserted.) You can then derive sd, using a similar sequence. Finally, you can proceed with the derivation of tcalc. 3. I often have difficulty in locating final answers for the questions within the sea of calculations. Therefore, clearly label each answer with the problem number and part, and draw a box around it. Example: 1.C. mean = 1.73 µg; median = 286 metric tons 4. In making the required graphs, pay attention to the guidelines concerning the drawing of histograms and the necessary components of all scientific figures. These components include: general neatness; use of graph paper (if done by hand); using a straight-edge in drawing all straight lines; at least 1” margins (empty space!) on all four sides of the paper; graphs sufficiently large for easy readability; a descriptive caption; axes labeled, including appropriate units of measure. 5. In general, keep your paper neat and easy to read. Points will be taken off for sloppiness, for incomplete answers, and for answers that I have to hunt for. 6. Include appropriate units for each answer (e.g., 1.73 µg, or micrograms; not just 1.73).
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