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

What type of association does this graph have?

• positive 
• negative
• none
• all of the above

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

What type of correlation do you think there is between:
Time Spent Watching TV & Grades

• Positive correlation
• Negative correlation
• No correlation
• cannot be determined

What would be the correlation be between study time and test grades?

• positive correlation
• negative correlation
• no correlation
• cannot be determined

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

• Yes

• No

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

• Yes

• No

What type of Correlation?

• Positive Correlation

• Negative Correlation

• No Correlation

What is the y-intercept?

• -2

• 3

• 2

• -3

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