Predicting Line of Best Fit

The scatter plot shows the amount of sleep Aria got the night before a test and her test scores. Which is the best prediction for Aria’s grade when she sleeps for 10 hours?

• 75

• 83

• 92

• 99

What is the equation of the line of best fit?

• y= 6x + 2

• y = -2x +6

Make a prediction for a resting heart rate after 6 hours of exercise a week.

• 6

• 50

• 55

• 59

Predicting the band grade after 3.5 hours of practice is an example of:

• Interpolation

• Extrapolation

• An outlier

This means to predict a value inside the known values on a graph.

• trend line

• interpolation

• extrapolation

• causation

This means to predict a value outside the known values on a graph.

• trend line

• interpolation

• extrapolation

• causation

Find the equation of the line of best fit for the given data

• y = 163.41x+1.49

• y =- 163.41x+ 4.19

• y =- 4.19x+163.41

• y = 4.19x -163.41

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

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

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