Scatterplot 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

What type of association does this graph have?

• positive

• negative

• none

• all of the above

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 220 pages.

• 22 chapters

• 20 chapters

• 18 chapters

• 26 chapters

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

• Graph A

• Graph B

• Graph C

• Graph D

Which scatter plot could have a trend line whose equation is y hat= 3x + 10?

• A

• B

• C

• D

Hey Anika, can you help us find the graph with the trend line that best fits the data? (a)  

• graph 1

• graph 2

• graph 3

• graph 4

Answer explanation

Graph 1 best fits the data as its trend line closely follows the overall pattern of the points, indicating a strong correlation. The other graphs do not align as well with the data points.

• 315

• 472.5

• 321

• 324

Sammy is selling his comic book collection on the internet. The scatterplot shows how many comic books he has left at the end of each day. Using the trend line, how many comic books should Sammy have left after 6 days?

• 15

• 10

• 30

• 8

Which scatter plot could have a trend line whose equation is y = 3x + 10?

• A

• B

• C

• D

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

• graph 1

• graph 2

• graph 3

• graph 4