Best Line of Fit

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

Determine the predicted income if 22 hours were worked on an assembly job.

• $207.30

• $449.60

• $691.90

• $543.30

Which graph has a correlation coefficient (r) of about -.6 ?

• a

• b

• c

• d

What does the value, r= -0.89, tell us about the linear relationship of two quantitative variables?

• Strong positive

• Weak positive

• Strong negative

• Weak negative

• y = 1.45x + 22
• y = -2x + 15
• y = 1.33x + 30
• y = -1.5x + 24

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

• Yes

• No

What is the equation of the line of best fit?

• y= 6x + 2

• y = -2x +6

TRUE OR FALSE: A line of best fit must go through the origin.

• True

• False

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

• Yes

• No

When you check your scatter plot to see if it is straight (linear), curved, or any other pattern you are looking at _________

• Form

• Direction

• Outlier

• Strength