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content/DAA/PL - Aula 1.md
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## Percentiles
There are 3 important percentiles:
- 50% - median
- 25% - 1st percentile
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>[!note]+
>These 3 percentiles allow the creation of box plot graphs. These specific graphs allow the discovery and presentation of outliers.
## Covariance & Correlation
>[!hint]+
>**Covariance** measures the direction of a relationship between two variables, while **correlation** measures the strength of that relationship.
Covariance is hard to interpret, thus correlation is used instead.
In a dataset, correlations >0.5 are considerable.
>[!caution] Correlation does not mean causation!
## Resource links