This guide will help you to identify and locate sources for data and statistics. Keep in mind that although "data" and "statistics" are often used interchangeably, there is a difference. Statistics are a form of data, while data in its "raw" form is not statistics.
Evaluate your sources
Be critical when viewing data and statistics.
Note that you may not always find statistics up to date -- it takes a while to collect the data and then publish it.
Statistics from government agencies should be trustworthy!
Always verify the source of the statistics. If they are from an organization or think tank, what is their mission? What is the funding source?
Look at the statistics carefully for obvious errors, and for manipulation in presentation
Look for bias. Anyone can take data and present it to suit their argument.