Please answer all questions.

1		Scientists who begin a study with preconceived ideas about what conclusions they will find in their data that then influence their observations in the direction of their preconceptions are committing the observer .
2		refers to the attempt by researchers to duplicate their previous findings and/or the findings of others.
3		is a technique used to obtain useful information that would otherwise be unattainable, because it would reveal the nature and goals of the study.
4		Research-oriented institutions are required to have review boards to insure the health and safety of participants in social psychological experiments.
5		observation is a method that observes and records behavior in its natural environment.