Vocabulary

1. the outcome factor
4. the group exposed to the treatment
6. type of sample where each member of the population has an equal chance of selection
8. type of sample where subgroups are represented proportionally
10. might produce an effect in an experiment
12. portion of the target population that is similar to the target population
13. an educated guess
16. the experimental factor (treatment) that is manipulated
18. both the participants and researchers are unaware of who is receiving the treatment
19. any factor other than the I.V.
20. an investigator manipulates one or more variables to observe the effect

2. a predisposition to a certain point of view despite what the facts suggest
3. collecting data through human or animal participants
5. a type of question that prompts or encourages the desired answer
7. participants do not know whether they are in the experimental group or the control group
8. collecting data by asking questions of people in a particular group
9. standards for proper and responsible behavior
11. total group to be studied or described and from whom samples may be drawn
14. a substance or treatment that has no effect apart from a person’s belief in its effect
15. the group not exposed to the treatment
17. assigning participants to groups by chance