What is the purpose and function of an institutional review board?  What is

What is the purpose and function of an institutional review board? 
What is the difference between deductive and inductive reasoning in research?
What are disadvantages of a convenience sample?
Give one example of a data collection method (surveys, interviews, focus groups, etc.) 
What is the difference between internal and external validity?
What is grounded theory research and how is it used best? 
How does a nurse know what (if any) knowledge in a research study is usable for clinical practice?.
Ans all these question in few sentences