Recently, a report was published describing a string of cases of Norwalk virus gastroenteritis among passengers on cruis

[answerhappygod]

Recently, a report was published describing a string of cases
of Norwalk virus gastroenteritis among passengers on cruise ships.
From this report, an epidemiologist went on to form a number of
hypotheses as to why there had been this rather unusual increase in
reported gastroenteritis outbreaks on cruise ships in 2012. The
cruise ship owners contacted the Centers of Disease control and
Prevention (CDC) to conduct an in-depth analysis of the possible
modes of transmission of the Norwalk virus in the cruise ship
environment. CDC investigators interviewed all of the passengers on
the last affected cruise (N=3,000) and obtained information on the
passenger’s recreational activities. They found the following
results: 1,000 passengers had gone swimming in the upper deck pool
and 2,000 passengers had never gone swimming in the upper deck
pool. 100 of the passengers who swam in the upper deck pool and 100
of the passengers who did not swim in this pool developed Norwalk
virus gastroenteritis during the cruise. FYI: The cruise lasted one
week.


Set up the 2x2 table for these data.
Calculate the risk ratio of gastroenteritis associated with
swimming in the upper deck pool.
State in words your interpretation of the above risk ratio
Calculate the risk difference in the above example
State in words your interpretation of the above risk
difference