Please define the following terms. If references are used, please cite.
• Theory - common language definition
• Theory - definition in science
• Testability of theory
• Phenomenon
• Concept
• Variable
• Psychology
• Psychology Theory
• Psychological Phenomenon
• Psychological Concept
• Psychological Variable
• Operational Definition
• Research
• Experiment
• Quantitative Research
• Qualitative Research
• Hypothesis
• Research Hypothesis
• Prediction
• Data