Without knowing the details, including what focus you're taking on the subject of robbery, what specifics your instructor has requested, and what citation style you've been asked to use, it's very difficult to suggest a specific example. However, you can find information and examples of written proposals here http://www.ais.up.ac.za/health/blocks/block2/researchproposal.pdf and here http://web.cocc.edu/cagatucci/classes/wr123/assignments/exproposal.htm. That may give you some great ideas for the direction you want to take with your proposal on robbery.
