When a police officer responds to a call for help in a case of spousal abuse,what should the officer do? A randomized controlled experiment in Charlotte,North Carolina,studied three police responses to spousal abuse: advise and possibly separate the couple,issue a citation to the offender,and arrest the offender.The effectiveness of the three responses was determined by re-arrest rates.The table below shows these rates. 
Suppose we wish to test the null hypothesis that the proportions of subsequent arrests are the same regardless of the treatment assigned.Under the null hypothesis,what is the expected number of times no subsequent arrest would occur for the treatment "Advise/separate"?
Definitions:
Issues
Topics or problems that are currently being discussed or need to be addressed.
Trauma
A deeply distressing or disturbing experience that can have long-lasting psychological impact.
War
A state of armed conflict between different countries or different groups within a country.
Terrorism
The unlawful use of violence and intimidation, especially against civilians, in pursuit of political aims.
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