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You have completed Data Analysis Basics!
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Data isn't always distributed the way you want. In this video we'll talk about a few of the different ways we can measure the spread of our data.
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One common way to describe the spread of
our data is to use the standard deviation
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which is commonly represented
as the Greek letter sigma.
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The standard deviation aims to tell us how
far away our data is from the average.
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To calculate it,
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we start by taking the difference
between each value and the average.
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Then we square each of those values,
add them up, and
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divide by the total number of values.
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This gives us the standard deviation
squared which is also called the variance.
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So to get this standard deviation, we just
take the square root and there we go.
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