### How to Calculate Variance

Watch more Intermediate Math Skills videos: http://www.howcast.com/guides/65-Intermediate-Math-Skills Subscribe to Howcast's YouTube Channel - http://howc.st/uLaHRS Calculate variance using a few quick computations following these steps. Howcast uploads the highest quality how-to videos daily! Be sure to check out our playlists for guides that interest you: http://howc.st/ytmainplaylists Subscribe to Howcast's other YouTube Channels: Howcast Health Channel - http://howc.st/HOE3aY Howcast Video Games Channel - http://howc.st/tYKKrk Howcast Tech Channel - http://howc.st/rx9FwR Howcast Food Channel - http://howc.st/umBoJX Howcast Arts & Recreation Channel - http://howc.st/vmB86i Howcast Sports & Fitness Channel - http://howc.st/vKjUjm Howcast Personal Care & Style Channel - http://howc.st/vbbNt3 Howcast empowers people with engaging, useful how-to information wherever, whenever they need to know how. Emphasizing high-quality instructional videos, Howcast brings you experts who provide accurate information in easy-to-follow tutorials on everything from makeup, hairstyling, nail art design, and soccer to parkour, skateboarding, dancing, kissing, and much, much more. Step 1: Find the sum of the numbers Add all of the numbers together to find the sum. Step 2: Divide the sum Divide the sum of the data by the number of values in the set to find the mean, or average. Tip For example, if the sum of 15 numbers is 300, dividing 300 by 15 you find that the mean is 20. Step 3: Subtract the mean from each value Subtract the mean, or average, from each value in the data set and then square the difference, or multiply the result by itself. Tip For example, if a value of 32 is in the example data set, subtract 20 from it, and square the result. The result is 12 squared, or 144. Step 4: Add the squared results Add all of the squared results together using a graphing calculator. Step 5: Divide by the number of values Divide by the number of values in the data set. This will give you the variance of the data. Use this value to compare variances, make predictions, and show off how well you analyzed the data. Did You Know? Sir Ronald Aylmer Fisher, known as the "Father of Modern Statistics," was a statistician and geneticist, and derived the concept of analysis of variance.

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