Does Hand Washing Save Lives?
In the mid-1800s, Dr. Ignaz Semmelweiss decided to make doctors wash their hands with a strong disinfectant between patients at a clinic with a death rate of 9.9%.
Semmelweiss wanted to test the hypothesis that the death rate would go down after the new hand-washing procedure was used.
What null and alternative hypotheses should he have used? Explain, using both words and symbols. Explain the meaning of any symbols you use.