Interpreting Linear Data in Scatter Plots

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 200 pages.

• 20

• 18

• 16

• 22

Phil collected data from several of his friends about the number of hours they spent sleeping and the number of hours they spent playing video games on Saturday. He recorded the data in the scatterplot. Based on the scatterplot, what is the best prediction of the number of hours one of Phil's friends spends sleeping when the friend spends 1 hour playing video games?

• 10

• 8

• 7

• 9

Julie made 25 international long-distance phone calls to London last month. The scatterplot below shows the length and cost of each phone call she made. Which conclusion is best supported by the scatterplot?

• As the length of a call increases, the cost of the call decreases.

• As the length of a call increases, the cost of the call increases.

• As the length of a call increases, the cost of the call remains the same.

• There is no relationship between the length of a call and the cost of a call.

Which scatterplot suggests a linear relationship between x and y?

• 
• 
• 
• 

As x increases, y increases

• no correlation

• correlation coefficient

• negative correlation

• positive correlation

What is a line of best fit used for?

• To connect the points

• To make predictions

• To make the graph look pretty

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

Which graph shows the line of best fit?

• A

• B

• C

• D

What is happening in this graph from point A to B? HINT: Look at the axis labels.

• The object is accelerating.

• The object is not moving.

• The object is decelerating.

• The object is moving at a constant speed.

What is happening in this graph from point C to D? HINT: Look at the axis labels.

• The object is accelerating.

• The object is not moving.

• The object is decelerating.

• The object is moving at a constant speed.

What is happening in this graph from point B to C? HINT: Look at the axis labels.

• The object is accelerating.

• The object is not moving.

• The object is decelerating.

• The object is moving at a constant speed.