Correlation Coefficient Practice

Front

What is a correlation coefficient?

Back

A correlation coefficient is a statistical measure that describes the strength and direction of a relationship between two variables, ranging from -1 to 1.

Front

What does a correlation coefficient of -1 indicate?

Back

A correlation coefficient of -1 indicates a perfect negative linear relationship between two variables.

Front

What does a correlation coefficient of 1 indicate?

Back

A correlation coefficient of 1 indicates a perfect positive linear relationship between two variables.

Front

What does a correlation coefficient of 0 indicate?

Back

A correlation coefficient of 0 indicates no linear relationship between two variables.

Front

What is considered a strong positive correlation?

Back

A strong positive correlation is typically indicated by a correlation coefficient close to 1, such as r = 0.8 or higher.

Front

What is considered a strong negative correlation?

Back

A strong negative correlation is typically indicated by a correlation coefficient close to -1, such as r = -0.8 or lower.

Front

What does a correlation coefficient of -0.3 indicate?

Back

A correlation coefficient of -0.3 indicates a weak negative correlation between two variables.

Front

How can you visually assess correlation in a scatterplot?

Back

You can visually assess correlation in a scatterplot by observing the direction and tightness of the points around a line; a clear upward trend indicates positive correlation, while a downward trend indicates negative correlation.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation implies that one variable directly affects the other.

Front

What is a scatterplot?

Back

A scatterplot is a graphical representation of two variables, where each point represents an observation, allowing for visual assessment of correlation.