# 4.8: Statistical Literacy

Skills to Develop

- Relationship between age and sleep

### Age and Sleep

The graph below showing the relationship between age and sleep is based on a graph that appears on this web page.

**Figure \(\PageIndex{1}\): **Graph showing relationship between age and sleep

Example \(\PageIndex{1}\)

Based on the graph in Figure \(\PageIndex{1}\) Why might Pearson's correlation not be a good way to describe the relationship?

**Solution**

Pearson's correlation measures the strength of the linear relationship between two variables. The relationship here is not linear. As age increases, hours slept decreases rapidly at first but then levels off.

### Contributor

Online Statistics Education: A Multimedia Course of Study (http://onlinestatbook.com/). Project Leader: David M. Lane, Rice University.