Interpreting Line of Best Fit

Students in a group of chess teams submitted data about hours of team practice and the number of matches the team won.  The graph shows the results of the data.  Based on the linear regressions equation y = 3.14x + 3.52, if a team practices 4.5 hours per week next year, which is the best prediction of the number of chess matches a team could expect to win?  

• about 24
• about 12
• about 8
• about 18

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.

Tags

CCSS.8.EE.B.5

What is the type of correlation?

• Negative 
• no association
• positive 

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

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

Tags

CCSS.HSF.IF.B.4

The equation of the trend line
is  y= 1/2x +1
How many laps can a bicycle
make around the park in
23 minutes?    

• 44 laps
• 12 1/2 laps
• 23 laps

What type of correlation does this graph have?

• positive 
• negative
• none
• all of the above

What type of correlation does this scatter plot show?

• positive 
• negative
• no correlation
• nonlinear association

The relationship of birthdays to candles

• Positive correlation
• Negative correlation
• No correlation
• all of the above

The number of siblings you have and your weight. 

• Positive correlation
• Negative correlation
• No correlation
• All of the above