Random sampling: estimate population size, uses a random number generator, comparing the populations of water snails in a clean pond with a polluted pond, uses 2 tape measures as grid axis, how many orangutans live in a forest, Systematic sampling: how a factor affects distribution of a species, quadrats placed at regular intervals, how water snails are affected by water pH, uses 1 tape measure as a reference line, how orangutan nests change away from palm oil plantations,

comparing sampling techniques

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