Correlation and Correlation Coefficient

Front

What is correlation?

Back

Correlation is a statistical measure that describes the extent to which two variables change together. A positive correlation means that as one variable increases, the other also increases, while a negative correlation means that as one variable increases, the other decreases.

Front

What is a correlation coefficient?

Back

The correlation coefficient is a numerical value that ranges from -1 to 1, indicating the strength and direction of a linear relationship between two variables. A value of 1 indicates a perfect positive correlation, -1 indicates a perfect negative correlation, and 0 indicates no correlation.

Front

What does a correlation coefficient of 0.89 indicate?

Back

A correlation coefficient of 0.89 indicates a strong positive correlation between the two variables, meaning that as one variable increases, the other variable tends to also increase.

Front

What does a negative correlation mean?

Back

A negative correlation means that as one variable increases, the other variable tends to decrease. This indicates an inverse relationship between the two variables.

Front

What is a scatterplot?

Back

A scatterplot is a graphical representation of two variables, where each point represents an observation. It is used to visualize the relationship between the variables.

Front

What does it mean if there is no correlation between two variables?

Back

If there is no correlation between two variables, it means that changes in one variable do not predict changes in the other variable. The correlation coefficient would be close to 0.

Front

What is a strong positive correlation?

Back

A strong positive correlation occurs when the correlation coefficient is close to 1, indicating that as one variable increases, the other variable also increases significantly.

Front

What is a weak negative correlation?

Back

A weak negative correlation occurs when the correlation coefficient is close to -1 but not very strong, indicating that there is a slight tendency for one variable to decrease as the other increases.

Front

How can you determine the type of correlation from a graph?

Back

You can determine the type of correlation from a graph by observing the direction of the points. If the points trend upwards from left to right, it indicates a positive correlation; if they trend downwards, it indicates a negative correlation; if they are scattered without a clear trend, it indicates no correlation.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, but it does not imply that one variable causes the other to change. Causation means that one variable directly affects the other.