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Across 7. Uses experimental and control groups (2 words) 9. Dependent and independent 12. Substance or treatment that has no effect apart from a person's belief in it 15. One need goes up, the other goes down (2 words) 16. Researchers select a sample that includes people of different ages (2 words) 18. Depends on the independent variable (2 words) 19. Asks people a series of questions on a particular subject 21. Means that people agree (2 words) 22. Observing behavior in a laboratory (2 words) 24. The whole group of people you want to study or describe (2 words) 26. One need goes up, so does the other one (2 words) 27. Part of the target population

Down 1. Recieves treatment (2 words) 2. An educated guess 3. Observing people or animals in their natural habitats (2 words) 4. Researchers select a group of participants and observe them over a period of time (2 words) 5. Participants do not know whether they are recieving treatment or not (2 words) 6. Measure of how closely one thing is related to another 8. Individuals are selected by chance from the target population (2 words) 9. When people who volunteer to participate in research studies often differ from people who do not (2 words) 10. Subgroups in the population are represented proportionally in the sample (2 words) 11. Neither participants or experimenters are aware of who has obtained treatment (2 words) 13. Participants recieve a treatment 14. Researchers can manipulate this to determine the effect (2 words) 17. To repeat a research study 20. Does not recieve treatment (2 words) 23. An in-depth investigation of an individual or small group (2 words) 25. Stands for proper behavior