1. The Scattergraph. 12345678910 140 150 160 170 180 Shoe Size HeightHeight

2. Height & Shoe Size. A group of people decided to investigate if there was any connection between their shoe sizes and their heights. They took the appropriate measurements and made a table of results. You know what they say. Big feet big ….. Shoes !!

3. Results Can you tell from the results if there is a connection between height and shoe size ? Quite hard to say. To make things easier we are going to plot the results on a scatter graph. Hold up your shoe sizes.

4. The Scattergraph. Create an appropriate X and Y axis. 12345678910 140 150 160 170 180 Shoe Size HeightHeight Now plot the results. Can you now see a connection between shoe size and height ? Yes.It shows an overall trend for taller people having larger feet

5. The Line Of Best Fit. 12345678910 140 150 160 170 180 Shoe Size HeightHeight You are now going to draw a straight line through the points called the line of best fit. The hints below show you how this is done. This line is too high as most points are below it. This line is too low as most points are above it. Line of best fit with roughly as many points above as below the line.

6. Using The Line Of Best Fit. 12345678910 140 150 160 170 180 Shoe Size HeightHeight The line of best fit allows us to answer the following type of question more accurately. What would you estimate the height of a person to be with a size 6 shoe ? Read the estimate from the graph as shown: Go from the shoe size to the line of best fit. Go from the line to the height axis. The answer is approximately 162cm