(You can also watch a video summary of this article on YouTube). We’ll also mention what “N standard deviations from the mean” refers to in a normal distribution. In this article, we’ll talk about standard deviation and what it can tell us. It can also tell us how accurate predictions have been in the past, and how likely they are to be accurate in the future. Of course, standard deviation can also be used to benchmark precision for engineering and other processes. Together with the mean, standard deviation can also indicate percentiles for a normally distributed population. It is a measure of dispersion, showing how spread out the data points are around the mean. So, what does standard deviation tell us? Standard deviation tells us about the variability of values in a data set. However, this raises the question of how standard deviation helps us to understand data. Standard deviation is used often in statistics to help us describe a data set, what it looks like, and how it behaves.
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