Answer to Summary Question 1

In the following 6 "quadrats" of plants, what is the average density (and standard error) of "white daisy" plants in plant/m2? Assume that each quadrat is 50 by 50 cm.
Answer to Summary Question 1  
        = There are 8 plants/m2 ± 2.7 stderr  
Plot Number of White Daisies per Plot Number of White Daisies per m2
Top-Left 1 4
Top-Mid 1 4
Top-Right 1 4
Bottom-Left 5 20
Bottom-Mid 3 12
Bottom-Right 1 4
--------------->                                     
To convert plot (50 x 50 cm) to m
2 just multiply by 4
verage plants/m2 = 8
Standard Deviation = 6.69
number of samples (n) = 6
Standard Error = 2.73
Note: StdErr = StdDev/Sqrt(n)  

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