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4) About 20 years ago, money was invested to create a forest by planting trees in an open field.
Researchers want to check on the progress of the trees. However, there are way too many trees
to examine each one. Therefore, it is desired to take a random sample. a) Although it would be
convenient and easy, it is not a good idea to just sample the first 50 trees the researcher walks up
to and sees. Why not? b) Describe how to carry out a cluster sample. c) What would be easier: a
cluster sample or simple random sample? Why?

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