Enter a confidence level. The confidence level is the individual confidence level for Fisher's method and the simultaneous confidence level for all other comparison methods. For more information, go to Understanding individual and simultaneous confidence levels in multiple comparisons.
Usually, a confidence level of 95% works well. A 95% confidence level indicates that, if you took 100 random samples from the population, the confidence intervals for approximately 95 of the samples would contain the mean response. For a given set of data, a lower confidence level produces a narrower interval, and a higher confidence level produces a wider interval.