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Scatter Diagrams

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# Scatter Diagrams - PowerPoint PPT Presentation

Scatter Diagrams. Part One: Drawing Them. Lesson Objective. To be able to draw a Scatter Diagram. Scatter Diagrams A Scatter Diagram is a graph of unconnected points When drawing graphs, we must remember to do the following things: Always give the graph a title

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## Scatter Diagrams

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### Scatter Diagrams

Part One: Drawing Them

Lesson Objective
• To be able to draw a Scatter Diagram

Scatter Diagrams

A Scatter Diagram is a graph of unconnected points

When drawing graphs, we must remember to do the following things:

Always give the graph a title

Always label both axis, including correct units

Choose a sensible scale

Plot your points carefully (x first, y second)

### Scatter Diagrams

Part Two: Interpreting Them

Lesson Objective
• To be able to interpret Scatter Diagrams
• To understand the terms Correlation and the Line of Best Fit

Interpreting Scatter Diagrams

The relationship between two variables is called a Correlation

A line of best-fit is a line which helps us to identify the type of correlation (positive, negative, no correlation) & make predictions

The line of best fit is drawn so that the points are evenly distributed on either side of the line

The closer the dots to the line, the stronger the correlation

Remember:

The line of best fit is a STRAIGHT LINE

It DOES NOT have to pass through the origin

It DOES NOT have to go through each point

Correlation can be strong or weak

Strong Positive Correlation

All the points lie close to the line of best fit

Weak Positive Correlation

The points are well spread out from the line of best fit but still follow the trend

A bit of work…

Exercise 10:2B, Page 229

Q1 - 3