# Surf for More Math

## Lesson 4 - Scatter Plots

To encourage students 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 students 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 students 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, click 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 students move 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.