Skewness |
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Skewness refers to how a distribution "leans". It is important to recognize skewness because it has strong implications in hypothesis testing. |

Let's examine three different kinds of skew:

Figure 1. |
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This symmetrical distribution has no skew. The mean exists perfectly at the center.

Figure 2. |
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This distribution is skewed to the right. The mean is pulled to the left from the center.

Figure 3. |
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This distribution is skewed to the left. The mean is pulled to the right from the center.