Sampling and bias
A random sample is a small group picked by chance from a larger population, and if the sample is representative, you can use it to make inferences about the whole population: for example, surveying 500 randomly chosen voters and finding 275 support a candidate gives a sample proportion of 275 / 500 = 0.55, or 55%, letting you estimate that about 55% of the whole population supports them too.
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Test your knowledge
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Midterm
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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Final, Part 2 of 2
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