# Surf for More Math

## Lesson 4 **- Scatter Plots**

To encourage your child to have fun on the Web
while learning about Scatter Plots, here are some games and interactive
activities they can do on their own or in pairs.

**Goal**

Create and interpret scatter plots.

**Builds Upon**

Student Book pages 78-80

### Instructions for Use

** **

** **

Scatter
Plot: Height and Hand lets your child make conjectures about possible
relationships between two characteristics of a sample.

To use Scatter Plot: Height and Hand, move
the cursor over the grid to position a data point. Click on the grid
to add the data point - a blue dot is added to the grid. After 2 points
are added, a red line and a yellow dot appear. The red line represents
the best straight-line approximation to the collection of data points.
The yellow dot shows the mean value of the data.

** **

To move a data point, press the 'Shift' key on
the keyboard. Click and drag the point to a new location. To delete
a data point, press the 'Ctrl' key on the keyboard, and click on the
point. To change the values in the 'Scale' boxes, input the range of
values in the text boxes and click the 'Apply' button. To clear the
graph, click the 'Clear' button.

Scatter
Plot lets your child create a scatter plot to see a trend emerging
in the data.

Notice there are 4-scatter plot grids to try. To use the first Scatter
Plot, click on the grid to plot data points. Click the 'Reset' button
to begin again.

To use the next Scatter Plot, click on the grid to plot data points.
Notice the changes in the ' line of best fit' as additional data points
are added.

In the last Scatter Plot correlation, c lick the 'New Sample' button
to show the points on the grid. Click and drag the red slider on the
right to change the correlation. Study the scatter plot and 'line of
best fit' as your child moves the slider. Click the 'Rollover help'
checkbox for additional information about the graph features. To change
the sample size, slide the clear slider at the right.