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### Course: Statistics and probability > Unit 5

Lesson 1: Introduction to scatterplots- Constructing scatter plots
- Making appropriate scatter plots
- Positive and negative linear associations from scatter plots
- Describing trends in scatter plots
- Positive and negative associations in scatterplots
- Outliers in scatter plots
- Clusters in scatter plots
- Describing scatterplots (form, direction, strength, outliers)
- Scatterplots and correlation review

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# Scatterplots and correlation review

A scatterplot is a type of data display that shows the relationship between two numerical variables. Each member of the dataset gets plotted as a point whose x-y coordinates relates to its values for the two variables.

## What is a scatterplot?

A scatterplot is a type of data display that shows the relationship between two numerical variables. Each member of the dataset gets plotted as a point whose $(x,y)$ coordinates relates to its values for the two variables.

For example, here is a scatterplot that shows the shoe sizes and quiz scores for students in a class:

Each data point is a student whose $x$ -coordinate gives their shoe size and $y$ -coordinate gives their quiz score.

*Want to learn more about constructing scatterplots? Check out this video.*

## What is correlation?

We often see patterns or relationships in scatterplots.

When the $y$ variable tends to increase as the $x$ variable increases, we say there is a

**positive correlation**between the variables.When the $y$ variable tends to decrease as the $x$ variable increases, we say there is a

**negative correlation**between the variables.When there is no clear relationship between the two variables, we say there is

**no correlation**between the two variables.*Want to learn more about types of correlation? Check out this video.*

## Practice

*Want to practice more problems like these? Check out this exercise on positive and negative correlations.*

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