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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

1. Finding Square Roots

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Exercise 5 Page 378

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: (8,33) and (9,36)
Gap: From 3.5 meters to 8 meters
Cluster: From 2 meters to 3 meters

Practice makes perfect

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

Length (meters), x	1	8	3.5	2	2.5	3	2.5	2.5	3	9
Weight (pounds), y	4	33	17	8	9	9	8	8.5	11	36

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

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

There appear to be outliers at (8,33) and (9,36).
There is a gap in the data from 3.5 meters to 8 meters.
There is a cluster of data from 2 meters to 3 meters.

Subchapter links

Try It p.374-376

Self-Assessment for Concepts & Skills p.376

Self-Assessment for Problem Solving p.377

Review & Refresh p.378

Concepts, Skills, & Problem Solving p.378-380