Question 4: How would the confidence interval change if 99% limits were used?
If 99% limits were used the confidence interval would be wider and more (99%) of confidence intervals from possible samples would contain the population incidence. Thus there would be less chance of being wrong but the range of possible population values would be greater. (The 99% confidence limits would be 5.8 to 9.2%).
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Last updated: 27 July, 2009.