You have a good start on a project, since you have a question that you need to answer. If this is your science fair project, you will need to state your hypothesis, and then design an experiment that will answer your question. With a question like this, you need to do background research to find out more about your topic. I would suggest researching the following terms to help you with your hypothesis, and give you ideas for designing an experiment.
psychology of negative words
psychology of questions
This could be a very good project. You might want to check out similar types of projects on the science buddies website to give you an idea of how to proceed:
http://www.sciencebuddies.org/mentoring ... ?from=Home
I hope this will help you get started to the next step of your project. Please let us know if you have any other questions.