Sampling and observational studies

Taking a sample and giving a survey is one of the most common ways to get information about a large population. Doing every step well is important though, otherwise your claims may be not accurate. This tutorial covers some of the basics of samples and surveys.

Reasonable samples

Valid claims

Making inferences from random samples

Identifying a sample and population

Identify the population and sample

Examples of bias in surveys

Example of undercoverage introducing bias

Correlation and causality