Measures of Spread Video

Now that you've been introduced to the different measures of spread, it will be helpful for you to see a video example of how these calculations are used. 

In this video you'll be shown two different data sets. Then you will see how the mean, range, variance and standard deviation are calculated for each data set. Keep in mind that in these examples, he is calculating the standard deviation for the population, rather than a sample like you read about on the last page. There is one small difference to the calculation for the standard deviation of a population vs. a sample. Can you spot what it is? 

I want you to have an understanding of how variance and standard deviation are calculated, but please note that you will not be required to calculate them by hand in our course.