Curriculum
Statistics — Third Secondary
Unit 1: Correlation and Regression
0/4
Unit 2: Advanced Statistical Measures
0/2
Unit 3: Probability
0/2
Unit 4: Random Variables
0/4
Unit 5: The Normal Distribution
0/2
Text lesson
Correlation
Correlation
The idea of correlation and the scatter diagram
The idea of correlation and the scatter diagram
- Correlation is the relationship between two variables we study how a change in one variable goes with a change in the other. Examples include the number of hours a student studies and the student’s exam score, or the temperature and the number of cold drinks sold.
- The relationship between two variables is shown by a scatter diagram.
- Each pair of values (x, y) is plotted as a point on the coordinate plane.
- The direction of the points tells us the type of relationship:
Key points
Positive correlationas x increases, y generally increases. The points rise from the lower left to the upper right.
Negative correlationas x increases, y generally decreases. The points fall from the upper left to the lower right.
No correlationthe points are scattered with no clear direction.
Correlation · 1 / 7