Vocabulary

2. both the participants and researchers are unaware of who is receiving the treatment
4. the outcome factor
7. portion of the target population that is similar to the target population
11. assigning participants to groups by chance
13. a predisposition to a certain point of view despite what the facts suggest
14. collecting data by asking questions of people in a particular group
15. the group exposed to the treatment
17. might produce an effect in an experiment
18. type of sample where subgroups are represented proportionally
19. a type of question that prompts or encourages the desired answer

1. the experimental factor (treatment) that is manipulated
3. an investigator manipulates one or more variables to observe the effect
5. type of sample where each member of the population has an equal chance of selection
6. any factor other than the I.V.
8. an educated guess
9. total group to be studied or described and from whom samples may be drawn
10. the group not exposed to the treatment
12. a substance or treatment that has no effect apart from a person’s belief in its effect
15. collecting data through human or animal participants
16. standards for proper and responsible behavior
18. participants do not know whether they are in the experimental group or the control group