Description: Learn the idea of Confidence Intervals! This tutorial explains what confidence intervals are at a high level and the process to follow to solve any CI question. In this video, you will learn the basic form that all types of confidence intervals use. This formula can be used no matter you are constructing a 90%, 95%, 99%, etc. confidence interval. First, you take your sample statistic (either x-bar, p-hat, difference between 2 means or proportions) and go left and right (plus or minus) your critical value times you standard error. The critical value is the critical z or t value corresponding to your distribution and how confident you want to be. Your standard error changes depending on what you are trying to estimate, but it ultimately always takes into account the variability in the data and the sample size. Finally, this video will explain how to interpret any confidence interval.
