A Study of Environmental, Social, and Governance Principles

That’s up to you to decide. It depends on the margin of error you are willing to tolerate for the estimates you make, and whether that’s a reasonable margin of error. Consult your statistics textbook for details.
2)Here are couple of requests/questions concerning your master’s thesis:
when do you plan to submit the thesis?

The master’s thesis should consist of between 10,000 and 15,000 words (including the list of references but excluding appendices). If the thesis is too short or too long, it will have a negative impact on the overall thesis evaluation and the final score.