Types of Correlation

Front

What is correlation?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. It can be positive, negative, or neither.

Front

What does a positive correlation indicate?

Back

A positive correlation indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What does 'neither' correlation mean?

Back

'Neither' correlation means there is no predictable relationship between the two variables.

Front

Example of positive correlation:

Back

The number of hours studied and the grade on a test. More hours studied typically lead to higher grades.

Front

Example of negative correlation:

Back

The number of inches of rain and the number of times a garden needs to be watered. More rain means less need for watering.

Front

What is the range of correlation coefficients?

Back

The range of correlation coefficients is from -1 to +1.

Front

What does a correlation coefficient of +1 mean?

Back

A correlation coefficient of +1 means there is a perfect positive correlation between two variables.

Front

What does a correlation coefficient of -1 mean?

Back

A correlation coefficient of -1 means there is a perfect negative correlation between two variables.

Front

What does a correlation coefficient of 0 mean?

Back

A correlation coefficient of 0 means there is no correlation between the two variables.