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

What type of association does this graph show?

• Positive
• negative
• none
• all of the above

Which sentence describes the relationship shown on this scatter plot?

• 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

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

• positive
• negative
• none
• cannot be determined

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

• $207.30

• $449.60

• $691.90

• $543.30

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

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

This measures how strong or weak the relationship between 2 quantitative variables are.

• Scatter Plot

• Causation

• Correlation

• Line of best fit

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

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

• Yes

• No