Scatter Plots & Correlation

Front

What is a scatter plot?

Back

A scatter plot is a graph that shows the relationship between two quantitative variables by displaying data points on a two-dimensional axis.

Front

What does correlation mean in statistics?

Back

Correlation refers to a statistical measure that describes the extent to which two variables change together.

Front

What is the correlation coefficient?

Back

The correlation coefficient (r) is a numerical value between -1 and 1 that indicates the strength and direction of a linear relationship between two variables.

Front

What does a correlation coefficient of r=1 indicate?

Back

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

Front

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

Back

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

Front

What does a correlation coefficient of r=0 indicate?

Back

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

Front

What is a positive correlation?

Back

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

Front

What is a negative correlation?

Back

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

Front

What does 'no association' mean in the context of scatter plots?

Back

'No association' means that there is no discernible pattern or relationship between the two variables in the scatter plot.

Front

How can you identify a linear relationship in a scatter plot?

Back

A linear relationship can be identified in a scatter plot if the data points form a straight line or a pattern that closely resembles a straight line.