When using a 95 percent confidence interval for a mean, the area in the upper tail of the distribution that is outside the interval is 5 percent.

Name: When using a 95 percent confidence interval for a mean, the area in the upper tail of the distribution that is outside the interval is 5 percent.
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When using a 95 percent confidence interval for a mean, the total area outside the interval (in both tails of the distribution) is 5 percent, meaning each tail contains 2.5 percent.

When Using a 95 Percent Confidence Interval for a Mean