Homework 1 Q2

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.

• A) r = -0.9

• B) r = 1

• C) r = 0.9

• D) r = -1

A perfect positive correlation has a correlation coefficient of ____. 

• 1
• -1
• 0

What type of association does this graph have?

• positive
• negative
• none
• all of the above

What type of correlation does this scatter plot show?

• Positive correlation

• Negative correlation

• No correlation

• Constant correlation

Which graph depicts the strongest positive correlation?

• 
• 
• 
• 

• Positive, strong
• Positive, weak
• Negative, strong
• Negative weak

r=-0.89

• Strong positive 
• Weak positive 
• Strong negative 
• Weak negative 

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

What is the correlation coefficient of the data characteristics shown?

• -.928

• .928

• .861

• -.861