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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

Chapter Review

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Exercise 1 Page 265

A scatter plot is a graph that shows the relationship between two data sets. Graph both sets of data as ordered pairs on a coordinate plane.

Graph:

Outliers: (12,70)
Gap: From 4 years to 8 years
Cluster: None

Practice makes perfect

A scatter plot is a graph that shows the relationship between two data sets. Let's consider the given table.

Age (years), x	15	3	14	12	8	11	9	4	13	10
Height (inches), y	67	38	65	70	50	58	53	41	63	56

Now, we will graph both sets of data as ordered pairs on a coordinate plane.

scattered plot

Next, let's recall some important definitions.

Outlier	Cluster	Gap
An outlier is a data point that is set off from the other data points.	A cluster is a group of points that lie close together.	A gap is an area on the graph that contains no data.

With these definitions in mind, we can finally make some conclusions about the outliers, clusters, and gaps in our graph.

There appears to be an outlier at (12,70).
There are no clusters of data.
There is a gap in the data from 4 years to 8 years.

Subchapter links

1 Scatter Plot p.265

2 Lines of Fit p.266

3 Two-Way Tables p.266-267

4 Choosing a Data Display p.267