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Cocoa plant type 1 yielded 155 bushels per acre last year at a research farm. This year, Cocoa plant type 2,

planted in the same location, yielded only 123 bushels per acre and there was a major freeze. The researchers do not know whether the difference is the result of the superiority of type 1 or the freeze. What is this an example of?

a.) bias

b.) confounding variable

c.) matched pairs design

d.) the placebo effect

e.) replication

Top Answer

the answer b.)... View the full answer

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