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Biometry
Biology 7530
Instructor: C. Ray Chandler

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The bulletin board is the site where I will post homework, data sets, practice problems, etc.


 

Week of 9 October:

HOMEWORK (Due Tuesday, 17 October)

a. I am studying provisioning rates of male and female robins. At each of ten nests, I record the rate (visits/hr) at which the male and the female feed young. Do the sexes differ in provisioning rate? Here are the data (male rate, female rate) from each nest. (7, 9) (10, 10) (11, 14) (7, 6) (5, 8) (13, 14) (12, 12) (8, 13) (9, 10) (5, 7)

DON'T BOTHER CHECKING ASSUMPTIONS FOR THESE:

b. I am studying pine beetles. I randomly select three trees (A, B, C) and two cones from each tree (1 and 2). I collect three beetles from each cone and measure mass in mg. Quantify the cources of variation in mass. (A1: 46, 34, 38; A2: 28, 31, 20; B1: 37, 49, 26; B2: 28, 31, 25; C1: 40, 41, 51; C2: 34, 39, 29).

c. In a study of how competition affects flower number, I randomly select 10 plants. I increase the number of competitors for 5 plants and decrease it for 5 others. I then measure the flower number of each plant for three months. Does competition or month affect flower density? Is the effect consistent across time? Here are data for the 10 plants:
 
TRT, APR, MAY, JUNE
 
+, 22, 25, 33
+, 16, 15, 21
+, 15, 33, 34
+, 16, 13, 34
+, 11, 13, 16
-, 26, 29, 41
-, 31, 35, 45
-, 19, 28, 34
-, 25 26, 39
-, 31, 38, 50
 
d. I measured blood cholesterol in 5 people who sequentially used three fad diets. Do the diets have different effects on cholesterol? Data are (individual, diet A, diet B, and diet C): (1, 270, 240, 265) (2, 156, 150, 170) (3, 170, 160, 160) (4, 200, 180, 185) (5, 145, 130, 135)


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