Interpreting the Line of Best Fit

The scatter plot shows the number of minutes people had to wait (y) for service at a restaurant and the number of staff (x) available at the time. The line of best fit is y = -1.62x+18. Interpret the slope in this situation

• The staff members decrease 1.62 people per minute.

• The staff members increase 1.62 people per minute.

• The wait time decreases 1.62 minutes per staff member.

• The wait time increases 1.62 minutes per staff member.

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

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

Which line is the best line of best fit?

• a

• b

• c

• i don't see any lines

In the scatter plot, does the image shows a "Line of Best Fit"?

• Yes

• No

The scatter plot below shows the number of books read by students in Mrs. Cates English class and their grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade.

• No relationship exists between the number of books students read and their English grades.

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

Based on the line of best fit for the scatter plot, which of the following amounts is closest to the cost of a 120-minute phone call?

• $10

• $12

• $15

• $20

The graph shows a line of best fit for data collected on the amount of time teenagers spend on the computer and watching television.  Based on the line of best fit, how much time does a teenager spend watching television if they spend 2 hours on the computer?

• 150 minutes

• 135 minutes

• 165 minutes

• 180 minutes

What type of association does this graph have?

• positive

• negative

• none

• all of the above