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Unformatted text preview: which would make the interval wider. The width of the confidence interval is related to the confidence level, standard error, and n such that the following are true: The higher the percentage of confidence desired, the wider the confidence interval. The larger the standard error, the wider the confidence interval. The larger the n, the smaller the standard error, and so the narrower the confidence interval. All other things being equal, a smaller confidence interval is always more desirable than a larger one because a smaller interval means the population parameter can be estimated more accurately. Figure 1. The relationship between point estimate, confidence interval, and z-score....
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- Fall '08