6.2.13

Scatter Graphs

Test yourself

Scatter Graphs

You should ignore outlying values that don’t fit with the general pattern. Outliers can move the line away from the rest of the values.

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Line of best fit

  • The two variables are correlated if you can draw a straight line that lies close to most of the points.
  • This line is called a line of best fit.
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Correlation and line of best fit

  • If it passes through almost all your points then there is strong correlation
  • If the points don’t line up so neatly there is only weak correlation
  • If it is not possible to draw a line of best fit then there is no correlation.
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Positive correlation

  • If the line of best fit slopes upwards the correlation is positive.
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Negative correlation

  • If the line of best fit slopes downwards the correlation is negative.
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No correlation

  • If it is not possible to draw a line of best fit then there is no correlation.

Jump to other topics

1Number

1.1Using Numbers

1.2Fractions, Decimals & Percentages

1.3Powers & Roots

1.4Accuracy

2Algebra

2.1Introduction to Algebra

2.2Manipulating Algebra

2.3Proofs & Functions

2.4Straight Line Graphs

2.5Common Graphs

2.6Transformations & Tangents

2.7Properties of Graphs

2.8Solving Equations

2.9Inequalities

2.10Sequences

3Ratio

4Geometry

4.1Introduction to Geometry

4.2Triangles & Quadrilaterals

4.3Transformations

4.4Circle Basics

4.5Circle Theorems

4.6Measurements & Units

4.7Calculating Area

4.8Triangle Formulae

4.93D Shapes

4.10Vectors

5Probability

6Statistics

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