Having run split tests on the e-commerce website at work, how do I extract meaningful conclusions from the raw data? [more inside]
posted by gi_wrighty on Jun 24, 2009 - 2 answers

How can an estimate of a health risk (eg 1 in 500) have a false positive? [more inside]
posted by anonymous on Apr 2, 2009 - 9 answers

Is there a formula or process to determine how many questions should be on an exam? Given a test bank of "x" number of questions, what "y" number of randomly selected questions constitutes a valid sample? [more inside]
posted by angiep on Dec 2, 2008 - 8 answers

In science, what is the difference between a theory and a law? Why is something called a law rather than a theory?
posted by furiousxgeorge on Jan 15, 2005 - 18 answers