Use the mouse to put points in the
blue area. After each point, the correlation coefficient and the regression
equation will be calculated. To remove points, select the

**Erase point**option, then click on the point you want removed.**Clear plot**will remove all the points;**Residuals**will pop up a scatter plot of X versus the residuals, as well as a histogram of the residuals. To add random points to the plot, press**Random points**, after changing the number and correlation for the new points if you wish.## Software/Applets used on this page

An applet from CUWUSTAT (regretfully, their web site appears to no longer be available).

## Glossary

### coefficient

The constant value in an expression, for example in 3x the coefficient of x is 3.

### correlation

The degree of relationship between two random variables, in the range -1 to 1.

### equation

A statement that two mathematical expressions are equal.

### histogram

A statistical diagram for continuous data similar to a bar chart but where the area of each bar is proportional to the frequency.

### plot

To mark a point on a graph accurately by using its coordinates.

### regression

A statistical model, whereby the expected value of a variable y is expressed in terms of known values of x.

### scatter plot

A scatter plot or scatter graph or scatter diagram displays as a collection of points, each having the value of one variable determining the position on the horizontal axis and the value of the other variable determining the position on the vertical axis.

## This question appears in the following syllabi:

Syllabus | Module | Section | Topic | Exam Year |
---|---|---|---|---|

AQA A-Level (UK - Pre-2017) | S1 | Correlation and Regression | Correlation | - |

AQA AS Maths 2017 | Statistics | Data Presentation and Interpretation | Correlation | - |

AQA AS/A2 Maths 2017 | Statistics | Data Presentation and Interpretation | Correlation | - |

CCEA A-Level (NI) | S2 | Correlation and Regression | Correlation | - |

Edexcel A-Level (UK - Pre-2017) | S1 | Correlation and Regression | Correlation | - |

Edexcel AS Maths 2017 | Statistics | Correlating Bivariate Data | Correlation | - |

Edexcel AS/A2 Maths 2017 | Statistics | Correlating Bivariate Data | Correlation | - |

I.B. Higher Level | 7 | Correlation and Regression | Correlation | - |

I.B. (MSSL) | 6 | Correlation and Regression | Correlation | - |

OCR A-Level (UK - Pre-2017) | S1 | Correlation and Regression | Correlation | - |

OCR AS Maths 2017 | Statistics | Scatter Diagrams and Correlation | Correlation | - |

OCR MEI AS Maths 2017 | Statistics | Scatter Diagrams and Correlation | Correlation | - |

OCR-MEI A-Level (UK - Pre-2017) | S2 | Correlation and Regression | Correlation | - |

Pre-U A-Level (UK) | Prob | Correlation and Regression | Correlation | - |

Scottish (Highers + Advanced) | HS | Correlation and Regression | Correlation | - |

Scottish Highers | S | Correlation and Regression | Correlation | - |

Universal (all site questions) | C | Correlation and Regression | Correlation | - |