The frequency of occurrence in a confidence interval can be a useful estimate?
mean ± 1 x Standard Error = 68.27%: twice a week
mean ± 2 x Standard Error =95.45% (1.96 = 95%): every three weeks
mean ± 3 x Standard Error = 99.73%: every year
mean ± 4 x Standard Error = 99.99%: every 43 years or twice a lifetime