Scatterplots, Trendlines, and Sampling

Mrs. Moises, the school counselor, keeps a candy jar in her office for students. During one week, she kept count of how many students came to visit her and the number of candies in the jar, as show in the scatter plot. Based on the trend line, what is the best prediction for the number of candies in the jar when 30 students visit her?

• 90

• 180

• 135

• 150

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

What type of association does this graph show?

• Positive

• negative

• no association

• non linear association

What type of association does this graph have?

• positive

• negative

• no association 

• non-linear association

The following scatter plot shows Pam's training as she prepares to run a 6 mile race at the end of the month.  Which of the following would be a reasonable approximation for the length of time it would take for her to run 6 miles? 

• 55 min

• 80 min

• 46 min

• 62 min

Mrs. Collins made a scatterplot to show the relationship between the number of absences and a student’s final exam score. Based on this scatterplot, a student with 6 absences should get approximately what score on the final exam?

• 65

• 92

• 70

• 76

Which scatter plot shows no association between relationship between x and y?

• Graph A

• Graph B

• Graph C

• Graph D

Which scatter plot shows a non-linear association between x and y?

• Graph A 

• Graph A and B

• Graph B and C

• Graph D

A small theme park is trying to determine the number of guests they should expect on a weekend, based on the temperature outside.  Based on the trend line, about how many guests should be expected if the temperature is around 80°?

• 8,300

• 8

• 7,300

• 9,300

What type of association does this graph have?

• positive 

• negative

• no association

• non linear association