Please answer all questions.

1		Scientists who go into a study with preconceived ideas about what conclusions they will draw from their observations are committing observer .
2		When researchers attempt to duplicate previous findings, they are using .
3		is a technique used to obtain useful information that would otherwise be unattainable.
4		To insure the health and safety of participants in social psychological studies, all research-oriented institutions have created review boards.
5		observation is an observational method that investigates behavior in its natural environment.