nterval estimation is the process of using a sample statistic to estimate a range of values in which the population parameter falls. The confidence level is the level of confidence associated with the confidence interval estimate. The confidence level is determined by the alpha, which is the risk you are willing to take of being wrong. Suppose your confidence level is 91%. Assuming you employ repeated random sampling and compute the confidence interval estimate for each sample, you would expect that of the intervals the population value