Scatterplots and Writing Linear Equations

What type of correlation does this graph have?

• positive 

• negative

• none

• all of the above

What type of correlation does this graph have?

• positive

• negative

• none

• all of the above

What is the correlation?

• Negative correlation
• No correlation
• Positive correlation
• All of the above

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Identify the independent variable.

• Total number of pages

• Number of chapters

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

In a scatterplot, an outlier...

• ...is something we didn't learn in 8th grade
• ...is a point on the origin
• ...is a point that is far outside the main cluster of points/ordered pairs
• ...is a group of points that are close together

The following scatter plot shows Pam's training as she prepares to run a 6 mile race at the end of the month.  Which of the following would be a reasonable approximation for the length of time it would take for her to run 6 miles? 

• A. 50 min
• B. 80 min
• C. 45 min
• D. 60 min

Find the rate of change (slope).

• slope = 1/3

• slope = 3

• slope = -3

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

Determine the y-intercept (b).

• b = 0

• b = 3

• b = -3