Asocial research methods class wants to study smoking. first the professor asks how many people in the class are smokers. two students say yes. then she asks how many people have smoked a cigarette in the past week, and ten students say yes. from this the class decided that, for the purposes of its survey, a smoker will be anyone who has had a cigarette in the past week and currently owns a pack of cigarettes. this is a(n):

This is an "operational definition".

The operational definition is a term that is utilized to depict the strategy of an investigation and the exploration factors. When contemplating the operational definition, it is helpful to envision what the examination is estimating and how it will be estimated.  

By having this operational definition, different analysts can reproduce the test. The operational definition tells the reader of the analysis what was regarded a positive or negative outcome, in this manner opening the trial up for replication and development by different therapists.

i got 3,4 and 5 as an answer