1. Which of the following statements about confidence intervals for proportions are true?
2. The confidence interval formula for proportions is valid if np 5 and

n(1-p) 5.

1. Confidence intervals with large sample size always contain the true parameter value, whereas

confidence intervals with small sample size may not.

1. 99% CI is narrower than 95% CI.
2. I and III only
3. II only
4. I only
5. I, II, and III