Asked by Lori

For a sample of 200 patients diagnosed with allergies, 25 were men. What is the 90% confidence interval for the population proportion? I set this up and got the answer of .087 -.16. The book has .091-.17. Could use help---I must be missing something.
Answered by PsyDAG
What is the confidence interval for? Allergies? Gender? Both?

Have you omitted some data? Mean? Standard deviation?
Answered by Lori
Actually that is the question given to me (only that info). I used the formula for the confidence interval for a proportion where you have to find the sample proportion. I used both 1.65 and 1.645 but to no avail to get that answer.