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Can you match the samples to the populations?

Problem



Here are three populations:

 

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An opportunity sample, a systematic sample and a random sample was taken from each.

Can you match the samples to the populations?

Opportunity samples (a convenient block of 9 squares was chosen):

 

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Systematic samples (every 11th square was chosen to give a sample size of 9):

 

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Random samples (9 squares were chosen at random):

 

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