Experimental uncertainty accounts for the fact that no experiment is conducted with perfect conditions. Despite the degree of sophistication of the equipment or experimental procedures utilized, there are still ways in which it could be better, as perfection is humanely unobtainable. These imperfections in our procedures, measurements, and equipment leave noise and other random errors in the values that we obtain leaving the true value an estimation. That estimation is called the 95% confidence interval, which accounts for this experimental uncertainty. This interval indicates that there is only a one in twenty chance that the true value is not within this interval.