# Case Study: Average Economic Growth Rate in the World Economy

Learn statistical inference and sampling distributions through a case study.

In the context of studying any substantive question, we first need to define what the population as the target of inference is and its relationship with the data we have available. Recall that the basic premise of valid statistical inference is random sampling, that is, each subject has an equal chance of being selected into a sample. This assumption is likely upheld in real probability samples but most likely violated in convenience samples.

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