Interpret Trend Lines

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

If Joe worked 30 hours, how much is he expected to earn?

• $600
• $200
• $1000
• $800

What would be the weight of a person who is 72 inches tall?

• About 180 lbs

• About 163 lbs

• About 153 lbs

• About 145 lbs

How long will Melissa wait if there are 6 people in front of her?

• 14 minutes

• 12 minutes

• 8.5 minutes

• 3 minutes

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 140 pages. 

• 12 chapters
• 19 chapters
• 14 chapters
• 21 chapters

Choose the graph with a trend line that best fits the data.

• graph 1

• graph 2

• graph 3

• graph 4

Which of the following lines represents the trend line for the scatter plot?

• A

• B

• C

• D

What is a line of best fit used for?

• To make predictions
• To make the graph look pretty
• To connect the points

Find the SLOPE for the trend line using points (2,2) and (4,3)

• 2

• 1/2

• -2

• -1/2

Find the EQUATION for the trend line (in slope-intercept form) using the points (2, 2) and (4, 3).

• y = 1/2x + 3

• y = 1/2x + 1

• y = 1/2x + 2

• y = 1/2x + -1