INTRASPECIFIC COMPETITION IN BRASSICA RAPA: PART 2(40 POINTS; Lab report due in
INTRASPECIFIC COMPETITION IN BRASSICA RAPA: PART 2(40 POINTS; Lab report due in your lab section the week of 20 October 2014) Lab Write-UpEach lab section will have their data posted on iLearn as an Excel file. The first sheet, labeled “1 Plant” at the bottom, will have all the data from the pots with one plant. The second sheet, labeled “6 Plants” at the bottom, will have all the data from the pots containing 6 plants. In the latter case, all of the data are mean values per pot (rather than total weights or counts). 1) Provide a properly labeled table with your individual data (for all three weeks from both pots) and the class data. For the class data, you may use the one I provide on iLearn!2) Make a series of bar graphs showing the mean values from the class-wide data for plant height, leaf number, bud/flower number, stem weight, and leaf weight. This should be done for each density (low and high), and, for variables that you measured in multiple weeks, you should have multiple bars (for example, you should have three bars for stem height, since we measured that each week). You can do each variable on a separate graph, or combine variables with the same measurement unit (like stem weight and leaf weight) on the same graph. When setting up your graphs, keep in mind that one of the things we’re interested in examining is whether these variables differed between low density pots and high density pots.3) For each density (low and high), make a scatter plot, using the class-wide data, of stem weight vs. leaf weight. You may make two separate graphs or put both data from both densities on the same graph.4) Using just the data from the last week (week 3), perform a series of t-tests comparing the low density pots to the high density pots. You should do a t-test for each of the following: (A) stem height; (B) leaf number; (C) bud/flower number; (D) leaf weight; and (E) stem weight. NOTE: Just like for the first two lab reports, in Excel you want to use the “t-test: two-sample assuming equal variances” option.5) Using the information obtained by looking at the answers for questions 2-4, address the following two questions: (A) how do plant characteristics change over time in each density treatment (that is, compare week 1 to week 2 to week 3 for both low and high densities)?; and (B) how do plant characteristics differ between the two density treatments (1 Plant vs. 6 Plants)? If you want, you can also speculate on whyyou think these changes/differences in plant characteristics occurred.6) How did the data for your two plants compare to the mean values from the class as a whole? Can you think of reasons why your plants might have been heavier/lighter, leafier/not-as-leafy, taller/shorter, or more or less flowery than the typical plant in class? Grading Rubric: Question 1 is worth 3 points; question 2 is worth 10 points; questions 3, 4 and 6 are worth 5 points each; and question 5 is worth 12 points.
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