The standardised normal distribution is used to develop a confidence interval estimate of the population proportion when the sample size is sufficiently large.

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The standardised normal distribution can be used to develop a confidence interval estimate of the population proportion when the sample size is sufficiently large. This is because a large sample size satisfies the conditions required for the central limit theorem, which allows the distribution of the sample proportion to be approximated by a normal distribution.

The Standardised Normal Distribution Is Used to Develop a Confidence