Describing Association

Linear or nonlinear association?

• Linear 

• Nonlinear

• Neither

• all of the above

Strong or weak association?

• Strong

• Weak

What type of relationship is shown by the graph?

• Strong positive relationship

• Moderate positive relationship

• Moderate negative relationship

• Strong negative relationship

A gardener tracks a correlation coefficient of 0.79 between the growth rate of his trees and the amount of fertiliser used. What can the gardener conclude from this result?

• The growth rate of the trees is influenced by the amount of fertiliser used

• An increase in tree growth increases the use of fertiliser

• There is no correlation between the growth rate of the trees and the amount of fertiliser used

• The growth rate of the trees influences the quality of the fertiliser used.

Using the same two-way frequency table, the percentage of Year 12 students who are left-handed is closet to...

• 6.8%

• 12.5%

• 14.3%

• 40%

The following two-way frequency table shows the results of a trial on new metal detectors for aircraft. The metal detector scans a piece of hand luggage and lights up if metal is found. Based on the results, the chance of metal going undetected in a piece of hand luggage is...

• 1%

• 10%

• 25%

• 75%

Which of the following graphs best depicts a strong negative relationship between the two variables?

• 
• 
• 
• 

What type of correlation does an r-value of 0.64 indicate?

• Strong, positive correlation

• Strong, negative correlation

• Moderate, positive correlation

• Moderate, negative correlation

How would you describe the direction of the association shown in the following scatterplot?

• Positive Association

• Negative Association

• No Association

How would you describe the direction of the association shown in the following scatterplot?

• Positive Association

• Negative Association

• No Association