1. CHAPTER 2: EXPERIMENTAL METHODS
CHRIS ALAS, BS
HCC-STAFFORD

2. SCIENTIFIC APPROACH
Dr. Chris has been teaching Intro to Psych for 5 years and the average grade for all his class is an 80. Research indicates that students who attend review sessions tend to score higher. So he sets up an experiment using 2 Psychology classes. One class will be taught without any interventions. The second class will have a review session during class time. Each class will have 50 students (PARTICIPANTS)

3. APPLICATION OF SCIENTIFIC APPROACH
1. Hypothesis
2. Independent Variable (IV)
3. Dependent Variable (DV)
4. Experimental group
5. Control group
6. Random assignment
7. Population
8. Sample

4. CHAPTER 2 – RESEARCH METHODS
INDEPENDENT VARIABLE
vs.
DEPENDANT VARIABLE

5. DESIGN A STUDY 4. SAMPLING BIAS
A new medication that makes people smarter has been discovered by Dr. Chris. Per FDA guidelines medicaltion “X” requires experiemental methods to ensure its’ effectiveness.
1. Placebo
2. Double-blind Procedure
3. Placebo effects
4. SAMPLING BIAS
CREATE SAMPLE NOT REPRESENTATIVE OF POPULATION OF INTEREST

6. CHAPTER 2 – RESEARCH METHODS
An experimenter test’s a hypothesis that physical exercise effects people’s mood. Participants in experimental group participate on Sat and Sun and those in control group exercise Mon and Tues.
What is DEPANDANT VARIABLE
What is INDEPENDENT VARIABLE
Experimenter Group

7. CHAPTER 2 – RESEARCH METHODS
TWO MAIN TYPES OF RESEARCH METHODS USED IN PSYCHOLOGY?
1. EXPERIMENTAL
2. DESCRIPTIVE/CORRELATIONAL
CORRELATION
CASE STUDY
SURVEY

8. CHAPTER 2 – RESEARCH METHODS
CORRELATION
1 or -1 is the strongest relationship
Signs give direction
SHOWS RELATIONSHIP NOT SHOW CAUSATION

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WHICH HAS THE STRONGEST RELATIONSHIP? A B
C. 0 D

10. CHAPTER 2 – RESEARCH METHODS
Correlation co-efficent between amount of exposure to TV violence and road rage was found to be What can we conclude?
Watching TV violence TENDS to cause aggressive driving
Being an aggressive driver TENDS to cause one to watch more violent TV
People who watch the most TV TEND to be the least aggressive driver
There is a POSITIVE RELATIONSHIP between these two variables

11. CHAPTER 2 – RESEARCH METHODS
Dr. Chris finds a correlation correlational of +66 between class attendance and GPA. This indicates that
a. people with high GPA tend to have low attendance
b. there is no relationship between GPA and attendance
c. students with high GPA tend to attend class regularly
d. students with a low GPA tend to have high attendance

12. CHAPTER 2 – RESEARCH METHODS
SURVEY
NATURALISTIC OBSERVATION
CASE STUDY

13. ETHICS…..WHY? RESPECT RIGHTS OF OTHERS RIGHT TO PRIVACY
PAID TO PARTICIPATE
PARTICPANTS SHOULD VOLUNTEER