1. Could the combination of data collection techniques yield more sources of information? How could data quality be improved? Justify your rationale.
2. How can the quality of the data be maintained? Justify your rationale.
3. During the study, some of the research was manipulated to ensure the data produced the most publishable findings, thus resulting in a nonreproducible study. What efforts can be made to address the lack of reproducibility? Provide suitable data collection methods to increase credibility in data collection. Include proper data sources in your justification.

Then, consider either an experiment involving a theoretical approach or propose one and address the following:

1. What are the most suitable strategies or approaches to this type of research? Justify your rationale.
2. How is proof of a concept determined?

Please I need the reference list.