This physics-exchange post does a great job at explaining why 5.0 sigma is required as a threshold for discovery in particle physics, http://physics.stackexcha

This physics-exchange post does a great job at explaining why 5.0 sigma is required as a threshold for discovery in particle physics, http://physics.stackexchange.com/questions/8752/standard-deviation-in-particle-physics http://physics.stackexchange.com/questions/8752/standard-dev...