Active Learning Lecture Slides Chapter 6 Association between Quantitative Variables Active Learning Lecture Slides For use with Classroom Response Systems

To look for association between numerical values we use a… bar chart. pie chart. boxplot. scatterplot.

To look for association between numerical values we use a… bar chart. pie chart. boxplot. scatterplot.

On a scatterplot, the response variable (which we would like to explain or predict) is on the… x-axis. y-axis. z-axis. none of the above.

On a scatterplot, the response variable (which we would like to explain or predict) is on the… x-axis. y-axis. z-axis. none of the above.

On a scatterplot, the explanatory variable (which we use to explain variation) is on the… x-axis. y-axis. z-axis. none of the above.

On a scatterplot, the explanatory variable (which we use to explain variation) is on the… x-axis. y-axis. z-axis. none of the above.

Which scatterplot shows a strong positive association? B. C. D.

Which scatterplot shows a strong positive association? B. C. D.

Which scatterplot shows a strong negative association? B. C. D.

Which scatterplot shows a strong negative association? B. C. D.

Which scatterplot shows no association? B. C. D.

Which scatterplot shows no association? B. C. D.

Which scatterplot shows a strong association between two variables even though the correlation is probably near zero? B. C. D.

Which scatterplot shows a strong association between two variables even though the correlation is probably near zero? B. C. D.

Which of the following are properties of the correlation? r measures the strength of linear association. r is always between –1 and +1. r does not have units. All of the above.

Which of the following are properties of the correlation? r measures the strength of linear association. r is always between –1 and +1. r does not have units. All of the above.

A correlation that results from an underlying, lurking variable is often called a… weak correlation. positive correlation. spurious correlation. strong correlation.

A correlation that results from an underlying, lurking variable is often called a… weak correlation. positive correlation. spurious correlation. strong correlation.