Scatterplots (College Board AP® Statistics)
Study Guide
Written by: Mark Curtis
Reviewed by: Dan Finlay
Scatterplots
What is a scatterplot?
A scatterplot is a graph displaying bivariate data
The explanatory variable is along the
-axisThe response variable is along the
-axis
Each point on the scatterplot represents a pair of data
The
-coordinate and the -coordinate
Points are plotted as small crosses or circles
Points are not joined up
Worked Example
A teacher is interested in the whether the amount of time her students spend on a computer per day is related to the amount of time they spend on a phone per day. She takes a sample of nine students and records the results in the table below.
Hours spent on a phone per day | Hours spent on a computer per day |
|---|---|
7.6 | 1.7 |
7.0 | 1.1 |
8.9 | 0.7 |
3.0 | 5.8 |
3.0 | 5.2 |
7.5 | 1.7 |
2.1 | 6.9 |
1.3 | 7.1 |
5.8 | 3.3 |
Draw a scatterplot for the data, with hours spent on a phone per day on the horizontal axis.
Answer:
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