In this tutorial I'm going to talk about calculating the standard deviation in variance they're both related this isn't high definition so click on 720 before you click the fullscreen view the button right there a typical problem looks like this the following are the number of jobs a sample of six people applied for find the mean the variance and standard deviation blah blah blah what you really are interested in they're just the numbers and how to calculate the variance and standard deviation and that's what I'm gonna do here the sample standard deviation is equal to the square root of the sample variance and these are the symbols I'm going to use and the first thing I'm going to calculate is a sample variance the sample variance is this formula right here and we'll take the square root of that to get the standard deviation the X I that's the observations the x-bar that's the mean and we'll go through the calculations of these each one of these two and n is the sample size I'm going to make a little table to help me stay organized and recommend that you do the same I'm gonna put in the X which did my observation and then we'll put a little line horizontal line and I'm gonna do an up-and-down vertical line as well the next column is the mean x-bar that's the mean the sample mean put a little vertical line as well now I'll just put in all the observations and that's the same as above a line and I'm gonna put a couple more column headings in and you'll see I'll tell you what those mean as we fill them in but just go ahead and write them in now and that's the observation minus...

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