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 be used to - 16p uvkrj29f8a tsmscompare dandelopi3/(xyp hb2ion population density in two fields, one of which is grazed by sheep, the othh xb2 (/yop3iper 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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