Scatter plot basics (with estimate correlation coefficient)

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 a positive correlation in a scatter plot indicate?

Back

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

Front

What does a negative correlation in a scatter plot indicate?

Back

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

Front

What is the correlation coefficient (r)?

Back

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

Front

What does an r value of 0 indicate?

Back

An r value of 0 indicates no correlation between the two variables.

Front

What does an r value of 1 indicate?

Back

An r value of 1 indicates a perfect positive correlation between the two variables.

Front

What does an r value of -1 indicate?

Back

An r value of -1 indicates a perfect negative correlation between the two variables.

Front

How can you estimate the correlation coefficient from a scatter plot?

Back

You can estimate the correlation coefficient by observing the direction and tightness of the data points around a trend line.

Front

What is a trend line in a scatter plot?

Back

A trend line is a straight line that best represents the data points in a scatter plot, showing the general direction of the relationship.

Front

What does it mean if a scatter plot has a strong correlation?

Back

A strong correlation means that the data points are closely clustered around the trend line, indicating a reliable relationship between the variables.