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Scatter Diagrams

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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  1. Scatter Diagrams Part One: Drawing Them

  2. Lesson Objective • To be able to draw a Scatter Diagram

  3. 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)

  4. Scatter Diagrams Part Two: Interpreting Them

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

  6. 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

  7. 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

  8. A bit of work… Exercise 10:2B, Page 229 Q1 - 3

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