statistics
posted by Ann .
The head of a computer science department is interested in estimating the proportion of students
entering the department who will choose the new computer engineering option. A preliminary sample
indicates that the proportion will be around 0.25. Therefore, what size sample should the department
head take if she wants to be 95% confident that the estimate is within 0.10 of the true proportion?

.......And what would be your answer to this question?

http://www.surveysystem.com/sscalc.htm#one
To the left, is a menu that will teach you.