184 / 762
184
Chapter 5: Bivariate Data
You can use the
Scatter Plot and Correlation
workbook to generate the
graph.
Based on the discussions so far, we are now in a position to define what we
mean by a scatter plot.
Definition: Scatter Plot
A scatter plot is a graph of ordered pairs (
x
,
y
) of values for the independent
variable
x
and the dependent variable
y
.
Observe from the plot that the number of tickets issued increases as the
number of drivers who were caught breaking the speed limit increases, and
that there seems to be a linear trend for this association.
In the next section, we will discuss what we should look for in a scatter plot.
Section Review
5-3 Looking for Patterns in the Data
Detecting an association or a relationship for bivariate data starts with a
scatter plot. When examining a scatter plot, one should try to answer the
following questions.
Is there a straight-line pattern or association or not?
e-Self Review Click here for the Scatter Plot and Correlation Workbook