Need psychology help with Psychology Questions about how children interact with each other during the school day

Need psychology help with Psychology Questions about how children interact with each other during the school day

1. A psychologist is interested in learning more about how children interact with each other during the school day. The psychologist is particularly interested in discovering the ways in which children behave when they donot think they are being watched. What research method would be best used to conduct this type of research, and why? What ethical concerns might be an issue in this type of research? 

2.  As a researcher, I am interested in learning whether or not there is a connection between sleep and test scores. I want to know if an increase in sleep improves test scores, for example. What type of research method would I use, and why? What ethical concerns might present an issue when conducting this type of research? 

3.  If I want to research whether or not a new medication has an effect on depression, and I want to compare the medication against a placebo, what research method might I use, and why? What ethical concerns might be an issue in this type of research?