Estimating Correlation Coefficient

The scatter plot shows the number coffee shops in different cities and the number of violent crimes. Which of the following is NOT true?

• A) As the number of coffee shops increase, violent crimes appears to increase.

• B) The line of best fit (regression line) shows a positive correlation

• C) The data has a positive correlation coefficient

• D) An increase in coffee shops causes an increase in violent crimes

What type of association does this graph have?

• positive 

• negative

• none

• all of the above

Estimate the correlation coefficient.

• r=-1

• r=1

• r=-0.5

• r=0.5

Describe the relationship between the variables.

• Strong positive correlation

• Weak positive correlation

• Strong negative correlation

• Weak negative correlation

Estimate the correlation coefficient

• r=1

• r=-1

• r=0

• r=-0.5

Estimate the correlation coefficient.

• Strong positive correlation

• Strong negative correlation

• Weak positive correlation

• Weak negative correlation

Describe the relationship.

• Strong positive correlation

• Strong negative correlation

• Weak positive correlation

• No correlation

Describe the relationship between the variables.

• Strong positive correlation

• Strong negative correlation

• Weak negative correlation

• Weak positive correlation

Describe the correlation in the graph shown.

• No Correlation

• Strong Negative

• Weak Positive

• Weak Negative

Describe a correlation with a coefficient of r=-0.89

• Strong positive

• Weak positive

• Strong negative

• Weak negative