Discuss the differences between causation and correlation

In 600 words please response to the following prompts,
1. Explain how and why comparative analysis is important as a research method. How is it different from field work and data collection/analysis in general?

2. Explain what constitutes empirical evidence and how it is important for analysis purposes. How does it differ from normative knowledge (what is normative)?

3. Discuss the differences between causation and correlation. What about plural causation?

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