6.5. Confidence Interval Estimate For The Proportion
A confidence interval estimate for an attribute can be constructed to estimate the proportion of successes in a given category. Instead of using the sample mean to estimate the population mean, you use the sample proportion of successes (p):
to estimate the population proportion (π). The sample statistic p follows a binomial distribution that can be approximated by the normal distribution for most studies.
To demonstrate the confidence interval estimate of the proportion, you can examine the situation faced by the quality engineer for a large city newspaper. In the production of a newspaper, ...
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