Imagine There Is a Forest with 2000 Trees, and We

question 2

Multiple Choice

Imagine there is a forest with 2000 trees, and we want to know the average height. Which of the following is the best procedure to generate an unbiased sample of size 50?

• A) Measure all the heights and then choose the 50 with the heights closest to the average.
• B) Measure the 50 trees closest to the center of the forest.
• C) Number all the tree, randomly generate 50 numbers between 1 and 2000, and measure those trees.
• D) Number all the trees, then starting with the first tree, measure each 2000/50 = 40th tree.

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