Interpreting Correlation

Estimate the correlation coefficient.

• r is close to zero

• r is close to -1

• r is close to 1

• r is close to -1.5

• r is close to 1.5

Estimate the correlation coefficient

• r = 1

• r = -1

• r ≈ -0.8

• r ≈ 0.8

• r ≈ -0.5

The correlation coefficient is a number "r" such that: 

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Estimate the correlation coefficient for this scatterplot. 

• r = -0.9

• r = 1

• r = 0.9

• r = -1

This graph has a correlation coefficient of -0.9. Interpret the correlation coefficient in the context of the problem.

• As the number of TVs in stock increases, the price per tv decreases.

• As the number of TVs in stock increases, the price per tv increases

• There is almost no relationship between TVs in stock and prices per tv.

A perfect negative correlation has a correlation coefficient of ____. 

• 1

• -1

• 0

Describe the correlation in the graph shown.

• No Correlation

• Strong Negative

• Weak Positive

• Weak Negative

What type of association does this graph have?

• positive

• negative

• none

• all of the above

What type of association does this graph have?

• positive 

• negative

• none

• all of the above