[PDF] confidence interval for proportion

Similar to confidence intervals for population means, a confidence interval for a population proportion is constructed by taking a sample of size n from the population, calculating the sample proportion ^p , and then adding and subtracting the margin of error from ^p to get the limits of the confidence interval.
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  • The result is the following formula for a confidence interval for a population proportion: p? +/- z* (p?(1 - p?)/n)0.5.
    Here the value of z* is determined by our level of confidence C.
    For the standard normal distribution, exactly C percent of the standard normal distribution is between -z* and z*.15 mar. 2019
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