Click on the following links. Please note these will open in a new window.

• Rand's Random Number Table--This is the source of one of the most famous collections of random digits and shows how they can be used. Rand Corporation, Santa Monica, California.
• Sample Size Calculator--Explains confidence intervals. “You can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed.”
• Sampling Methods for Political Polling--The American Association for Public Opinion Research (AAPOR) provides a brief overview of the sampling methods utilized in political polling.
• Sampling Methods--The Center for Innovation in Research and Teaching’s overview of sampling and types of sampling methods commonly used in quantitative research.