Correlation Line of Best 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

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

• Yes

• No

Select the statement that best describes the line.

• The line is the line of best fit.

• The line is NOT a line of best fit because it does not pass through two points.

• The line is NOT a line of best fit because it does not go through the middle of the data set.

• The line is NOT a line of best fit because it does not go through the origin.

Which sentence describes the relationship shown on this scatterplot?

• As the temperature decreases, the visitors increase. 

• As the temperature increases, the number of visitors increases. 

• As the visitors increase, the temperature decreases. 

• No correlation

• y= 1/2x+8
• y= -1/2x+8
• y= 1/4x+8
• y= -1/4+8

The table shown is comparing a person's foot length to their height in cm. Calculate a line of best fit.

• f(x) = 25.05x + 5.57

• f(x) = 5.57x + 25.05

• f(x) = -5.57x + 25.05

• f(x) = 5.57x - 25.05

r=-0.89

• Strong positive 

• Weak positive 

• Strong negative 

• Weak negative 

Estimate the correlation coefficient for this scatterplot. 

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Describe the correlation in the graph shown.

• Strong Negative

• Strong Positive

• Weak Negative

• Weak Positive