Correlation Causation

Which example shows a CORRELATION?

• It rained and the ground is wet.

• Ice cream sales increase as temperature increases.

Carbon dioxide levels in the atmosphere are increasing. Fossil fuel use is increasing. Knowing just these two facts and NO OTHER INFORMATION, what is this?

• Both

• Causation

• Correlation

Which example shows a CORRELATION? (The events show correlation, but one thing does NOT cause the other thing to happen.)

• It rained and the ground is wet.

• Ice cream sales increase as temperature increases.

Describe the relationship between the variables.

• no correlation

• strong positive correlation

• strong negative correlation

• weak positive correlation

Estimate the correlation coefficient

• r= -0.9

• r= 0.9

• r=-0.5

• r=0.5

Describe the relationship between the variables.

• Weak positive correlation

• Weak negative correlation

• Strong positive correlation

• Strong negative correlation

Describe the correlation in the graph shown.

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive

Estimate the correlation coefficient for this scatterplot. 

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Which sentence describes the relationship shown on this scatterplot?

• As the temperature decreases, the visitors increase. 

• As the temperature increases, the number of visitors increases. 

• As the visitors increase, the temperature decreases. 

• No correlation