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

Rand's Random Number Table — Chapter 7 discussed the use of tables of random numbers to collect simple random samples. 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 in Research — Fridah W. Mugo sampling's methods for “beginners.” They explain sampling error, for example.