Linear Regression and Correlation Coefficient

Front

What is the correlation coefficient?

Back

The correlation coefficient is a statistic that measures the strength and direction of a linear association between two quantitative variables.

Front

What does a correlation coefficient of r=0 indicate?

Back

A correlation coefficient of r=0 indicates no correlation between the two variables.

Front

What does a correlation coefficient of r=1 indicate?

Back

A correlation coefficient of r=1 indicates a perfect positive linear correlation between the two variables.

Front

What does a correlation coefficient of r=-1 indicate?

Back

A correlation coefficient of r=-1 indicates a perfect negative linear correlation between the two variables.

Front

What type of correlation is shown when the scatter plot slopes upwards from left to right?

Back

Positive correlation.

Front

What type of correlation is shown when the scatter plot slopes downwards from left to right?

Back

Negative correlation.

Front

What does a weak positive correlation look like on a scatter plot?

Back

A weak positive correlation shows points that are loosely clustered around a line that slopes upwards.

Front

What does a strong negative correlation look like on a scatter plot?

Back

A strong negative correlation shows points that are closely clustered around a line that slopes downwards.

Front

What is the difference between correlation and causation?

Back

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

Front

What is a scatter plot?

Back

A scatter plot is a graph that displays values for typically two variables for a set of data.