Scatterplots
Name:
A ___________________________________ is a graph that relates two different sets of data by displaying them as
ordered pairs.
Correlation
There are three types of relationships that the two data sets may have.
__________________
(when y tends to increase as x increases)
__________________
(when y tends to decrease as x increases)
__________________
(x and y not related)
Example: What type of correlation would exist between the data sets?
1. children’s ages and height
2. age and eye color
3. children’s ages and time needed to run a certain distance
Trend Lines
A ___________________ is a line drawn on a scatter plot, drawn near the points, that shows a correlation. You can use
the trend line to predict values outside of the known data values.
Example: The scatter plot below shows the number of tornadoes in the United States since 1950. Draw a trend line to
represent the data. About how many tornadoes would you expect to
occur in 2015?