In this post, we use the approximate confidence interval, as an interval estimate for p , where z is the appropriate quantile for the standard normal distribution. This syllabus dot point is a part of the QCE Maths Methods course under the topic Interval Estimates for Proportions and the Normal Distribution and sub-part Confidence Intervals for Proportions.
( \hat{p} - z \sqrt{ \frac{\hat{p}(1-\hat{p})}{n}}, \hat{p} + z \sqrt{ \frac{\hat{p}(1-\hat{p})}{n}})
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