1. Effects Of Dietary Provisions On Depressive Mood
... studies were all experimental designs, the researchers were able to control for various conditions such as physical (e.g., blood samples), emotional and psychological states (questionnaires). A possible threat to the internal validity of the studies is the use of questionnaires. There is always the possibility that the participants are either not being honest or do not completely understand the questionnaire. The ... affect the external validity of these studies. The researchers successfully established causal connections between variables within the studies. By using experimental design...
- Word Count: 1793
- Approx Pages: 7
- Has Bibliography
- Grade Level: Undergraduate