9-1 Scatter Plots

Bivariate data consist of two variables or two numerical observations. A scatter plot is a graph that shows the relationship between bivariate data. The data is graphed as ordered pairs on the coordinate plane. Once variable or value, does not necessarily depend on the other variable or value.

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​Example of a scatter plot

Multiple Choice

What is a scatter plot?

• A graph that shows the relationship of two data sets.
• A graph drawn using rectangular bars to show how large each value is.
• A graph that shows information that is connected in some way.
• A graph that shows data changing over time.

​Association/Pattern

Multiple Choice

What type of association does this graph have?

• Negative

• no association

• positive

Multiple Choice

What type of association does this graph have?

• positive

• negative

• none

• all of the above

Multiple Choice

What type of association does this scatter plot show?

• positive

• negative

• no correlation

• nonlinear association

Multiple Choice

Based on the scatterplot, which of the following conclusions about the relationship between her height and weight is true?

• There is a negative relationship between height and weight

• There is a positive relationship between height and weight

• There is a constant relationship between height and weight

• There is no relationship between height and weight

​Linear or Nonlinear

Multiple Choice

What type of association does this scatter plot show?

• positive linear association
• negative linear association
• no association
• nonlinear association

Multiple Choice

Which scatter plot shows a linear relationship between x and y?

• Graph A
• Graph B
• Graph C
• Graph D

​Cluster and outliers

Multiple Choice

In a scatterplot, an outlier...

• ...is something we didn't learn 8th grade
• ...is a puppet with a long nose named Pinocchio
• ...is a point that is far outside the main cluster of points/ordered pairs
• ...is a really naughty point who doesn't tell the truth when outside

Multiple Choice

Identify any outliers.

• Outlier at x = 18

• Outlier at x = 12

• Outlier at x = 6

• There aren't any outliers in this graph.

Multiple Choice

Identify any clusters.

• Cluster at x = 14

• Cluster at x = 18

• Cluster at x = 24

• There aren't any noteworthy clusters in this graph.