| Types of experiments | - Laboratory experiments
- Field experiments
- Quasi (natural) experiments |
| Lab experiments | CAUSE/EFFECT - High control - manipulate IV ECOLOGICAL VALIDITY - Artifical |
| Field experiments | CAUSE/EFFECT - Manipulate IV - not complete control ECOLOGICAL VALIDITY - More like real life |
| Quasi experiments | CAUSE/EFFECT - Natural occurring IV - Cannot say cause and effect ECOLOGICAL VALIDITY |
| One-tailed hypothesis meaning | - One group is better than the other |
| Two-tailed hypothesis meaning | - The difference between the groups |
| Different experimental designs | - Independent measures design
- Repeated measures design
- Matched pairs design |
| Independent measures design | - Using different individuals for each condition of the experiment |
| Disadvantages + advantages of INDEPENDENT MEASURES DESIGN | - Advantages = no problem with order effects
- Disadvantages = problem with individual differences |
| Repeated measures design | - Testing the same individuals on two or more conditions |
| Disadvantages + advantages of REPEATED MEASURES DESIGN | - Advantages = no problem with individual differences, requires fewer participants
- Disadvantages = it is not always possible to test the same participants twice, problem with order effects |
| Matched pairs design | - Using different individuals for each condition of the experiment - Participant variables are controlled by matching pairs |
| Disadvantages + advantages of MATCHED PAIRS DESIGN | - Advantages = no problems with order effects
- Disadvantages = its difficult and time consuming, too dependent on the validity of the procedures for pre-testing |
