The confidence interval for a proportion uses the following formula:
A) $ \mathrm{p} \pm Z S_{p} $
B) $ S_{p} \pm Z P $
C) $ \bar{X} \pm Z S_{s} $
D) none of the above

Question

Quizplus · Accepted Answer

The formula for the confidence interval for a proportion is p ± ZSp, where p is the sample proportion and Sp is the standard error of the sample proportion. This formula uses the normal distribution and assumes that the sample size is large enough to justify using the normal approximation to the binomial distribution. Option A is the only choice that uses this formula.

The Confidence Interval for a Proportion Uses the Following Formula p±ZSp \mathrm{p} \pm Z S_{p} p±ZSp​

The Confidence Interval for a Proportion Uses the Following Formula $\mathrm{p} \pm Z S_{p}$