A Tree Farmer Hires a Botanist to Evaluate a Blight

question 10

Essay

A tree farmer hires a botanist to evaluate a blight that seems to be affecting his trees. The trees are planted in horizontal rows on a hill and the blight seems to be a bigger problem near the bottom of the hill. The farmer wants to know the extent of the damage to the trees. Since the trees must be destroyed to examine them, the botanist doesn't have time to examine all the trees, so she will select a sample. Several plans for choosing the sample are proposed. Name the sampling strategy in each.
a. Randomly select three trees from each orizontal row.
b. Lay out a grid on a map of the hill. Randomly select eight squares from the grid, and check all trees in those squares.
c. Randomly pick a number from 1 to 30. Start at the tree at that position in the first row,then go to every 30th tree after that.
d. Check the ten trees closest to the parking lot where the botanist parks her car.

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