Specify default settings for interval plots. The changes you make to the defaults remain until you change them again, even after you exit Minitab.
 Type of Interval

 Standard error: Display standard error bars, which extend one or more standard errors from the mean.
 Confidence interval: Display confidence intervals. The confidence intervals assume a normal distribution for the data and use tdistribution critical values.
 Standard Error Intervals

 Multiple: Specify a positive number to use as the multiplier for standard errors.
 Confidence Intervals

 Level: Enter a number between 1 and 100 to specify the confidence level. The interval bar end points correspond to the values of a confidence interval for the mean.
 Bonferroni: Calculate Bonferroni intervals.
 Side

Select the location of the bars. For confidence intervals, onesided bars are shorter than the same side of the twosided bars because Minitab uses a onesided test. For standard error bars, the distance the bars extend above or below the mean remains the same, regardless of the side that you specify.
 twosided: Draw bars above and below the mean.
 upper onesided: Draw bars above the mean.
 lower onesided: Draw bars below the mean.
 Pool error across groups
 Use the pooled degrees of freedom to calculate the critical value from the tdistribution for confidence interval bars. Or use a pooled standard error instead of calculating the error for each subgroup for standard error bars.