Scatter Plots and Lines of Fit

The scatter plot represents a negative correlation.

• TRUE

• FALSE

What is the correlation coefficient? (Round to the nearest hundredth.)

Which graph represents the correlation of its given situation correctly?

• A

• B

• C

• D

It's reasonable to predict that if there are 75 negative reviews the number of cell phones sold of that same model will be close to 600,000.

• TRUE

• FALSE

Using the equation y= -10x + 216 for the line of best fit and x representing the years since 2004, predict the number of students who will drop out in 2012?

• -20, 2996 students

• 21 students

• 136 students

• 156 students

What is the correlation coefficient? (Round to the nearest hundredths. Type the number only.)

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

Which scatter plot shows a linear relationship between x and y?

• Graph A

• Graph B

• Graph C

• Graph D

440 turtles 40 turtles 150 turtles 90 turtles

• 440 turtles

• 40 turtles

• 150 turtles

• 90 turtles

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

• To make it look like you know what you are doing