本题目来源于试卷: SL Topic C4.1 Populations and communities，类别为 IB生物学
[问答题]
8. Describe how quadrat sampling could beg9; dy/w krv)f5jh3t y used to compare dandelion populaz:p7g+ 1tq i 15ltcucption density inz7 c1+ :p it51ctuqlgp two fields, one of which is grazed by sheep, the other is not grazed by sheep.
参考答案: Sampling must be random.
Measuring tape (or string) is laid out on two sides of the field.
Random numbers are generated on a calculator to determine quadrat positions.
Quadrats are placed on the grid locations.
The number of dandelion plants in the quadrat are counted.
Sufficient quadrat samples, repeats, must be taken to ensure a valid sample.
The data is compared using a suitable statistical test (chi-squared test or t-test).
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