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Course: Statistics and probability > Unit 5
Lesson 2: Correlation coefficientsCorrelation coefficient review
The correlation coefficient r measures the direction and strength of a linear relationship. Calculating r is pretty complex, so we usually rely on technology for the computations. We focus on understanding what r says about a scatterplot.
What is a correlation coefficient?
The correlation coefficient measures the direction and strength of a linear relationship. Calculating is pretty complex, so we usually rely on technology for the computations. We focus on understanding what says about a scatterplot.
Here are some facts about :
- It always has a value between
and . - Strong positive linear relationships have values of
closer to . - Strong negative linear relationships have values of
closer to . - Weaker relationships have values of
closer to .
Let's look at a few examples:
Want to learn more about the correlation coefficient? Check out this video.
Practice problem
Want to practice more problems like this? Check out this exercise on correlation coefficient intuition.
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