The confidence level is a complement to the significance level.

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The confidence level, typically expressed as a percentage (e.g., 95%), represents the proportion of times that the confidence interval would contain the true parameter if the experiment were repeated multiple times. The significance level (alpha), usually set at 0.05 (or 5%), is the probability of rejecting the null hypothesis when it is true. Since the confidence level and significance level are complementary, adding them together equals 100%. For example, a 95% confidence level corresponds to a 5% significance level.

The Confidence Level Is a Complement to the Significance Level