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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 left parenthesis, x, comma, y, right parenthesis 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.

## 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.
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When the y variable tends to decrease as the x variable increases, we say there is a negative correlation between the variables.
start color #ca337c, start text, N, e, g, a, t, i, v, e, space, c, o, r, r, e, l, a, t, i, o, n, end text, end color #ca337c
When there is no clear relationship between the two variables, we say there is no correlation between the two variables.
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