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Old 07-30-2007   #1
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Default statistics - sample size?

I am writing a thesis on "Violence in NHS Hospitals". Part of my investigation involves a study on NHS Staff. I have a questionnaire with 15 questions to apply but cannot calculate the sample size to make this research project representative to the population. Cuantitative variables have a formula to calculate this after a pilot test, but my main variable is CUALITATIVE, how do I calculate it? HEEEELLP!