BIOL 180 Lecture 4: Testing Hypotheses Mathematically
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Angel of death: kristen gilbert working in a hospital and people dying of cardiac arrest on her shifts. Null hypothesis: there is no correlation between the two variables. # of deaths/total patients for gilbert and other doctors are the same. Variables that might need to be controlled for: # of deaths/total patients for gilbert is wildly larger than other doctors. Coworkers, time measured, day of the week, time of the day, time of year. Death rate on gilbert"s shifts will be much larger than shifts of other doctors. There is an increased death rate during gilbert"s shifts. There is no difference in the death rates during gilbert"s shifts and other shifts. (this is how you would describe the null hypothesis; not how to state it) The increased death rate during gilbert"s shifts is due to random chance. Related to the null: probability of 1/1000,000,000 that the increased death rate we observed on gilbert"s shifts are due to random chance.
