Question: 1. Why is research design important? 2. What is the difference between a cross-sectional study design, and a longitudinal study design. 3. There are three

1. Why is research design important? 2. What is the difference between a cross-sectional study design, and a longitudinal study design. 3. There are three types of case study designs related to investigation. Mention and explain! 4. Explain the difference between internal validity and external validity.

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