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Question: Timber! A lumber company wants to estimate the proportion of trees in a large forest that are ready to be cut down. They use an aerial map to divide the forest into 200 equal-sized rectangles. Then they choose a random sample of 20 rectangles and examine every tree that's in one of those rectangles.

(a) What is the name for this kind of sampling method?

(b) Give a possible reason why the lumber company chose this method.

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