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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!
4 Answers
- Anonymous1 decade ago
I don't know how you calculate the sample size but spending any time in an NHS A&E department would show that a large proportion of staff are abused physically and verbally .
- cvandy2Lv 61 decade ago
The equation for calculating sample size for a qualitative variable is:
n = [Z(sub α/2)Ï/E]²
Where Z(sub α/2) is the standard normal variate and is a function of the confidence you want in you hypothesis decision (confidence = 1-α)
The standard deviation, Ï, is estimated from your pilot test or guessed.
E is the error in your estimate you are willing to tolerate. You don't get something for nothing.
So you need to determine your α-risk and your acceptable tolerance, E, before you can calculate the required sample size.
