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To calculate the confidence limits for a measurement variable, multiply the standard error of the mean times the appropriate t-value. The t-value is determined by the probability (0.05 for a 95% confidence interval) and the degrees of freedom (nâ1).
on whether the Interval Type is set to Lower Limit or Upper Limit. Standard Deviation S (Standard Deviation) Enter an estimate of the standard deviation (must be positive). The sample size and width calculations assume that the value entered here is the standard deviation estimate that is obtained from the sample.imilarly, the one-sided 100(1 â Î±)% lower confidence limit is 1 221 1 1 /, ï£¾ï£½ï£¼ï£³ï£²ï£± â â n â ns Ï Î±For two-sided intervals, the distance from the standard deviation to each of the limits is differen t. Thus, instead of specifying the distance to the limits we specify the width of the interval, W.