The Line of Best Fit

If the points on a scatter plot are very close to the line of best fit, what does this indicate about the correlation of the data?

• There is no correlation

• There is a weak correlation

• There is a moderate correlation

• There is a strong correlation

What is the line of best fit?

• y = 5/3x + 375

• y = 1/3x + 475

• y = 5/3x + 3

• y = 1/3x + 375

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x + 170

• y = 25x + 170

• y = 5/8x + 170

Find the slope for the trend line using points (2,2) and (4,3)

• 2

• 1/2

• -2

• -1/2

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 is the equation of the line of best fit?

• y= 2x+3

• y=3x+2

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

• Graph A

• Graph B

• Graph C

• Graph D

• y = -5/8x + 6

• y = 5/8x + 6

• y =-8/5x + 6

• y = 8/5x + 6

The graph above shows a line of best fit for data collected on the distance bicyclists have remaining in relation to the amount of time they have been riding.  What is the equation of the line of best fit?

• y = -25x + 170

• y = 25x + 170

• y = -(5/8) x + 170

• y = (5/8) x + 170

Over the next few slides, we are going to write the equation for the line of best fit shown on this scatterplot.

What should we do first?

• Calculate the slope

• Calculate the y-intercept

• Connect all the dots on the graph to make a picture