From the course: Statistics Foundations 1: The Basics
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Empirical rule - Microsoft Excel Tutorial
From the course: Statistics Foundations 1: The Basics
Empirical rule
- The empirical rule. I know, it sounds scary. But, actually the empirical rule is very useful for understanding the distribution of data points in our data sets. So what is it? First, it's important to note that this rule works for symmetrically, or normally distributed data. On this chart, the zero is in the middle of the x-axis. That's the mean of the data set. The data points in our data set are distributed in a bell shaped pattern that is centered at the mean. As you can see, our data are symmetrically distributed, or mirrored on each side of the y-axis. We call this a normal distribution. Once we understand this, we can now break down the empirical rule. The empirical rule tells us that most of the data points in our data set fall within three standard deviations of the mean. Notice, at the bottom along the x-axis the numbers one, two, three moving to the right and negative one, negative two, and negative…
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