Scatter Diagrams & Correlation Coefficient

Which is the best line of best fit?

• Red

• Blue

• Green

• Purple

What relationship is suggested by the scatter diagram?

• Line of best fit

• As age increases, weight increases

• As age increases, weight decreases

• No relationship between age and weight

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 12 absences should get approximately what score on the final exam?

• 60

• 92

• 70

• 76

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

Number of steps taken per day and number of kilometers walked per day.  $r=.92$  

• strong positive

• strong negative

• weak positive

• weak negative

Car weight and distance traveled using a full tank of gas.  $r=-.86$  

• strong positive

• strong negative

• weak positive

• weak negative

Score on science exam and number of words written on the essay question.  $r=.28$  

• strong positive

• strong negative

• weak positive

• weak negative

Average time spent listening to music per day and average time spent watching TV per day.  $r=-.17$  

• strong positive

• strong negative

• weak positive

• weak negative

What is the correlation between length of running start and distance of jump?

• positive:  the further you run the further you jump
• negative: the less you run the less distance of your jump
• positive: the further your running start the less your distance

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

• A
• B
• C
• D