Co-Variables
- E.g. If a researcher want to invesigate the the relationship between stress and illness, stress would be one co-variable (CoV1) and illness would be the second co-variable (CoV2).
Confounding/Extraneous Variables
- Theses are often classified as participant and situation variables (something about the participants could confound the results or the results could be confounded by situational or enviromental factors).
How to overcome these problems
- Age - Mixed groups, random allocation, categories and age group.
- Investigation Bias - Use people who are not influencial, keep emotionless.
- Weather conditions - forecast or take place in a Lab.
- Demand characteristics - Single Blind technique.
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