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).
The constant value in an expression, for example in 3x the coefficient of x is 3.
The degree of relationship between two random variables, in the range -1 to 1.
A statement that two mathematical expressions are equal.
A statistical diagram for continuous data similar to a bar chart but where the area of each bar is proportional to the frequency.
To mark a point on a graph accurately by using its coordinates.
A statistical model, whereby the expected value of a variable y is expressed in terms of known values of x.
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:
|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||-|
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1 The PMCC
2 Guess the PMCC
3 Powers of 10
4 Calculate the PMCC 2
5 Calculate the PMCC 3
6 Calculate Sxx, Syy and Sxy 1
7 Calculate Sxx, Syy and Sxy 2
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11 Plotting points
12 Population v. area
15 Calculate the PMCC on a GDC
16 Exam O-test
17 Timed O-test
18 Exam O-test 1
19 Exam O-test 2
20 Exam timed O-test
21 Exam Question 2001
22 Exam Question 2001
23 Exam Question 2003
24 Exam Question 2007
25 Exam Question 2007
26 Exam Question 2007
27 Exam Question 2008
28 Exam Question 2008
29 Exam Question 2008
30 Exam Question 2008
31 Exam Question 2009
32 Exam Question 2010
33 Exam Question 2011