Correlation Notes

Positive or negative correlation?

• Positive

• Negative

Positive or negative correlation?

Number of cloudy days vs amount of sunscreen sold

• Positive

• Negative

For two variables with a correlation coefficient of 0.9, which of the following statements is true?

• There is a weak positive linear relationship between the variables.

• There is a strong positive linear relationship between the variables.

• There is a strong negative linear relationship between the variables.

• There is no linear relationship between the variables.

If the correlation coefficient between two variables is 0, what does this indicate about the relationship between the variables?

• Perfect positive linear relationship

• Perfect negative linear relationship

• No linear relationship

• Cannot be determined

Determine the correlation coefficient of the given data.

• - .5477

• .1770

• .8956

• - .9463

As shown in the table, a person's target heart rate during exercise changes as the person gets older. Find the correlation coefficient (r).

• -0.999

• -0.664

• 0.998

• 1.503

Which scatter plot shows no relationship?

• Graph A

• Graph B

• Graph C

• Graph D

Predict what the next point would be on the scatterplot.

• (30,100)

• (20,20)

• (10,0)

What is the dependent variable?

• Sunglasses Sold

• Ice Cream Sales

• Independent

What is the independent variable?

• Precipitation

• Cucumber Yield

• kg