Line of Best Fit

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

• A

• B

• C

• D

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. 

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

• Graph A

• Graph B

• Graph C

• Graph D

The equation of the trend line
is  y= 1/2x +1. What does the x variable represent? 
   

• The number of laps

• The amount of time in hours

• The amount of time in minutes

• How long it takes to go 0 laps

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

Describe the correlation in the graph shown.

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive

Write the equation that best matches the graph shown.

• y = 4x

• y = 4x - 3

• y = 4/3 x + 4

• y = 4/3 x - 3

• y = -5/8x + 6

• y = 5/8x + 6

• y =-8/5x + 6

• y = 8/5x + 6

If m = -3/4 and b = 9, what is the equation of the trend line in y= mx + b?

• 0 = -3/4 (9) +9

• y = -3/4 x + 9

• y = -3/4 x - 9

• y = 3/4 + 9

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line given and write an equation.

• y = 0x +10

• y= 0.1x+10

• y= 10x +0

• y= 0.1x +0