Curriculum
Course: Statistics — Third Secondary
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Curriculum

Statistics — Third Secondary

Unit 1: Correlation and Regression

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Unit 2: Advanced Statistical Measures

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Unit 3: Probability

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Unit 4: Random Variables

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Unit 5: The Normal Distribution

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Text lesson

Correlation

Statistics — Third Secondary

Correlation

Lesson summary

Lesson summary

  • Correlation is the relationship between two variables, shown by a scatter diagram.
  • Positive correlation y tends to increase as x increases. Negative correlation: y tends to decrease as x increases.
  • The correlation coefficient r lies between −1 and +1. The sign gives the direction and the size gives the strength.
  • r = (n Σxy − Σx Σy) ÷ √[(n Σx² − (Σx)²)(n Σy² − (Σy)²)].
  • A strong correlation does not mean causation. r does not give the slope of the line and is not used to predict values.
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