Web site with explanations and online tools demonstrating the types of statistical tests and procedures used in the social sciences. Includes tools for calculating probabilities, frequencies, chi-square tests, correlations and regressions, t-tests, ANOVA, ANCOVA, and more.

The Research Methods Knowledge Base is a comprehensive web-based textbook that addresses all of the topics in a typical introductory undergraduate or graduate course in social research methods. It covers the entire research process including: formulating research questions; sampling (probability and nonprobability); measurement (surveys, scaling, qualitative, unobtrusive); research design (experimental and quasi-experimental); data analysis; and, writing the research paper (website).

This website serves as the leading source of quality data about the nation's people and economy. The Bureau operates under Title 13 and Title 26 of the U.S. Code. The goal of the Census Bureau is to provide the best mix of timeliness, relevancy, quality, and cost for the data and services provided (website).

Search for census data on this website from the United States Census Bureau.