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
- 90 percent, 95 percent, 6 pounds, 204 pounds