Describe the Correlation

What is the correlation between length of running start and distance of jump?

• positive: the further you run the further you jump

• negative: the less you run the less distance of your jump

• positive: the further your running start the less your distance

• negative: the more you run the less distance you jump

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

• -1<r<1

• -1>r>1

• -1≤r≤1

• -1≥r≤1

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

Describe a correlation with a coefficient of r=-0.89

• Strong positive

• Weak positive

• Strong negative

• Weak negative

Describe a correlation with a coefficient of r=0.3

• Strong positive

• Weak positive

• Strong negative

• Weak negative

Estimate the correlation coefficient

• r = 1

• r = -1

• r ≈ -0.8

• r ≈ 0.8

• r ≈ -0.5

• strong positive

• strong negative

• weak positive

• weak negative

What type of association does this scatter plot represent?

• positive linear association

• negative linear association

• no association

• nonlinear association

perfect negative correlation has a correlation coefficient of ____. 

• 1

• -1

• 0