Correlation and Predictions of Linear Functions

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters
• 15 chapters
• 18 chapters
• 21 chapters

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

What type of correlation does this scatter plot show?

• positive 
• negative
• no correlation
• nonlinear association

What is the type of correlation?

• Negative 
• no correlation
• positive 

• 18 laps

• 6 laps

• 22 laps

• 4 laps

Use the line of best fit to approximate rate of change relative to the scatter plot above.

• 7/5

• 5/7

• -7/5

• -5/7

Which sentence describes the relationship shown on this scatter plot?

• As the temperature decreases, the visitors increase. 
• As the temperature increases, the number of visitors increases. 
• As the visitors increase, the temperature decreases. 
• No correlation

Which scatterplot below has a correlation coefficient close to r= -0.89?

• 
• 
• 
• 

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

• Yes

• No

Scatterplot A is the graph on the left. Scatterplot B is the graph on the right. Select all the TRUE statements about the Scatterplots.

• Both scatterplots have a positive correlation.

• Scatterplot A (left), has a greater correlation coefficient than Scatterplot B (right). 

• Scatterplot B has a stronger correlation than Scatterplot A. 

• If Scatterplot B has r = 0.352, then Scatterplot A has to have a correlation coefficient less than 0.352.