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Another possible reason is that confidence intervals are often embarrassingly wide. It’s hardly reassuring to report that the average improvement was 12 ± 9, or even 12 ± 15.
S. A. Murphy, Likelihood Ratio-Based Confidence Intervals in Survival Analysis, Journal of the American Statistical Association, Vol. 90, No. 432 (Dec., 1995), pp ...
Richard K. Burdick, Franklin A. Graybill, Confidence Intervals on Linear Combinations of Variance Components in the Unbalanced One-Way Classification, Technometrics, Vol. 26, No. 2 (May, 1984), pp.