From: Stan Hilliard
Date: 10/16/2005
Time: 9:19:56 PM
YOU SAID: "Another question: Is the "p" above just for two choice questionare?"
MY ANSWER: Yes, p is for two categories.
For example, if the possibilities are "knowledgeable", "caring", "patient" ... you could base the sample size as if only two categories exist.
For example, p' = fraction patient = number of students choosing patient / Total students
With the sample results, you can re-calculate p for each of the multiple categories from the sample.
Solve the previous equation for the margin of error (d).
With the equation for d, use the actual sample size (n) and the calculated sample-fraction (p) of each of the multiple categories to calculate a margin of error for each category.