Unit 2 Review Part 1

Front

What does the correlation coefficient (r) indicate in a scatter plot?

Back

The correlation coefficient (r) measures the strength and direction of a linear relationship between two variables. It ranges from -1 to 1.

Front

What is the value of r when there is a perfect negative correlation?

Back

r = -1

Front

What is the value of r when there is a perfect positive correlation?

Back

r = 1

Front

What does an r value of 0 indicate?

Back

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

Front

If r = -0.9, what can be inferred about the relationship between the variables?

Back

There is a strong negative correlation between the variables.

Front

What does a scatter plot with points closely clustered around a downward sloping line indicate?

Back

It indicates a strong negative correlation, with a correlation coefficient close to -1.

Front

What does a scatter plot with points scattered randomly indicate about the correlation?

Back

It indicates no correlation, with a correlation coefficient close to 0.

Front

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

Back

By observing the direction and tightness of the clustering of points; closer clustering indicates a stronger correlation.

Front

What is the significance of an r value of -0.5?

Back

An r value of -0.5 indicates a moderate negative correlation between the variables.

Front

What does it mean if the correlation coefficient is close to 1?

Back

It means there is a strong positive correlation between the two variables.