Line of Best Fit [10.23]

Which sentence describes the relationship shown on this scatter plot?

• The more time spent training, the longer it takes to run 100 m.  
• As the time spent training increases, the time to run 100 m decreases. 
• As the time spent training decreases, the time to run 100 m decreases. 

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

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

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.

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55
• 0
• 103
• 100

Which of the following lines represents the line of best fit for the scatter plot?

• A
• B
• C
• D

What type of association (correlation) does this graph have?

• positive
• negative
• none
• all of the above

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

• positive
• negative
• none
• cannot be determined

What type of association does this graph show?

• Positive
• negative
• none
• all of the above

What is the equation of the line of best fit

• y= -2x + 10

• y= 10x+ 2

• y= 10