Use observations about differences between two or more samples to make conjectures about the populations from which the samples were taken. 0806.5.6

Links verified on 1/29/2010

1. Designing the Sample or Population for Data Collection - posted by the U.S. General Accounting Office, Program Evaluation and Methodology Division. Developing and Using Questionnaires
2. I'll Give You a Definite Maybe - an introductory handbook for probability, statistics, and excel
3. Populations and Samples - from Cliffs Notes