Sampling and Observational Studies

This lecture series discusses the studies conducted using surveys. You can use surveys to obtain information about a group of people, but it can be impossible to survey each person if the group is very large. The limited number of people surveyed is called a sample. The way a sample is selected can affect the outcome of a study and its validity. Watch the videos and complete the interactive exercises.

Identifying a sample and population


Source: Khan Academy, https://www.khanacademy.org/math/ap-statistics/gathering-data-ap
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