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Dr. Darwin is interested in studying turtle hatching on a chain of 3 islands, Sandy, Blue and Eagle. Dr. Darwin first wants to estimate the total number of nests on the island chain. To do this, he first finds the total surface area of the islands, 22km2. He lands his boat on the sheltered side of the largest island, and draws a 100m by 100m square in the sand starting from the point he came ashore. He then counts the number of nests inside the square, and finds 8.
State
the type of variable being recorded,
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the name of this type of sampling technique.
Give two reasons Darwin's measurement is unlikely to produce a reliable estimate of the total number of nests.
Dr. Darwin makes a second attempt at data collection. This time, he visits each island, and takes 4 separate 100m×100m samples, one on each side (north, west, south & east) of the island. The data for the number of nests found in each sample are provided in the table below.
State the name of this type of sampling technique.
Using the data collected, estimate the total number of nests across the island chain.
Sandy & Blue both have a surface area of 9km.
Find the surface area of Eagle Island.
Explain why the estimate found in (c.iii) is unlikely to be accurate.
Using the same data as in (b.iii), give a revised estimate, to the nearest hundred, for the total number of nests across the island chain.
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