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hey there andy robertson here with cqe academy and in todays video i want to go through some of the fundamental concepts and control charts and then talk about one of the most popular control charts out there the x bar on our chart all right lets head over the computer and dive in all right lets go ahead and get into it what im showing here is kind of the agenda for todays lecture so im going to start with talking about the two types of variation so the beauty of a control chart is that it helps us distinguish between special and common cause variation thats exactly why we use them so i want to talk about what those things are and then were briefly going to talk about the key elements of control chart these are those unique features of a control chart that help us distinguish between normal and special cause variation and then theres a really important topic in control charts called rational subgrouping so i want to talk about that and then were going to go through both the