1. Natural and Field experiments
Miss Minaker

2. Experimental methods Three types of experimental methods Lab study
Field studies
Natural/quasi experiments

3. Field Experiments
A field experiment is similar to a lab experiment, but there are some differences
Read the description on pg 137 and complete the boxes on the sheet

4. Field Experiments Read the example of a field study by Bickmann (1974)
Identify the IV and the DV
Explain why it is a field study.

5. Field Experiments
Loftus and Palmer carried out a lab study into the accuracy of eyewitness testimony.
How could they have investigated EWT using a field experiment?

6. Field Experiments
Read through the strengths and weaknesses. Highlight the important information

7. Natural/Quasi Experiments
Key features
IV not under control of experimenter. Naturally occurring event
Used when manipulation of the IV would be impractical or unethical.

8. Natural/Quasi Experiments
Rad the example study by Charlton et al (2000) p147
Identify the IV and the DV
Explain why it is a natural experiment.

9. Natural/Quasi Experiments
Read through the strengths and weaknesses. Highlight the important information

10. Quasi vs. Natural Experiments
Both terms used
There is a difference
Natural is when something has happened to the participants to make the two groups different
Quasi is a naturally occurring variable
You do not need to know the difference between natural and quasi experiments for AS, but it is still worth knowing!