Describe a research proposal. What is the purpose of a proposal?

Describe a research proposal. What is the purpose of a proposal?
Three nursing research questions needed to be answered. Please see information below.
Week 1
Refer to syllabus for requirements of discussion board post. Answer each question with a minimum of 125 words. Please cite textbooks as a reference.
Describe a research proposal. What is the purpose of a proposal?
What does it mean to replicate a research study? Is replication a good or bad idea in nursing research? Why or why not?
What study will you use to replicate in your proposal? Why did you choose to replicate this study for your proposal?
Textbooks:
Grove, S. K., Burns, N., & Gray, J. R.(2013). The Practice of Nursing Research: Appraisal, Synthesis and Generation of Evidence. (7th) St. Louis: Saunders/Elsevier.
Kim, M. & Mallory, C. (2014). Statistics for Evidence – Based Practice in Nursing. Burlington, MA: Jones & Bartlett.