a) i) Plan one is only testing at ONE point
ii) By having 4 sites there are more results taken meaning it is easier to identify anomalous results, and by asking the weight of the cardboard it is easier to record/measure with reliable and standard parameters ie. kg
iii) Whereas in Plan two it is possible, and very likely, that each collector will only know an estimate of the weight of their cardboard if the students measured the cardboard and plastic themselves their results would be more accurate
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