Need math help To investigate how trans fat might affect fertility

timer Asked: Mar 17th, 2016

Question description

1.  To investigate how trans fat consumption might affect fertility, researchers analyzed data available from 18,555 healthy women who participated in the Nurses' Health Study between 1991 and 1999.

A.  Observational Study

B.  Experiment

C.  Simple random sampling

D.  Stratified random sampling

E.  Systematic random sampling

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