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Bonferroni confidence intervals
Minitab calculates confidence intervals for the standard deviations using the Bonferroni method. A confidence interval is a range of values that is likely to include some population parameter, in this case, contain the standard deviation.
Standard confidence intervals are calculated using a confidence level 1 – α / 2. the Bonferroni method uses the confidence level 1 – α / 2p for each individual confidence interval, where p is the number of factor and level combinations. The method ensures that the set of confidence intervals has a confidence level of at least 1 – α. The Bonferroni method provides more conservative (wider) confidence intervals, which reduces the probability of a type 1 error.