Scatter Plot Analysis (Notes p. 12-16)

Gianna created the scatter plot shown. Which would NOT be a reasonable variable for the y-axis?

• The height of a plant

• The percentage of a project remaining

• The total number of miles run

• The balance of a savings account

Remi and Devon created the scatter plots shown. Whose scatter plot displays both association and causation?

• Remi's only

• Devon's only

• Both Remi and Devon's

• Neither Remi nor Devon's

Yazmin created a scatter plot and calculated the correlation coefficient to be -0.25. Which of the following is NOT a correct assumption about Yazmin's scatter plot?

• A. The overall shape will decrease from left to right.

• B. The scatter plot has negative association.

• C. As the value of x increases, the value of y decreases.

• D. The scatter plot has strong association.

The scatter plot shown displays the average weekly temperature outside over several weeks and the number of firewood bundles sold at a local hardware store that week. Which is the most reasonable value of 'r'?

• r = 0.91

• r = -0.13

• r = -0.89

• r = 0.24

What is the correlation coefficient for the percentage of students who are bus riders and car riders at various middle schools?

• r = -0.99

• r = -1.1

• r = -0.09

• r = -0.79

Deja and Michael each created a scatter plot and found the correlation coefficient as shown below. What must Deja and Michael's scatter plots have in common?

• Both scatter plots have strong association.

• Both scatter plots display causation.

• Both scatter plots have negative association.

• Both scatter plots increase from left to right.

The table compares the internet speed of a home's WIFI network and the average number of movies streamed each month. Based on the correlation coefficient, what is the strength of linear association between the variables?

• Strong positive association

• Strong negative association

• Weak positive association

• Weak negative association

A study found that as the number of years of higher education completed by a person increases, the average amount of student loan debt increases. Describe the association and if there seems to be causation.

• Negative association; causation

• Positive association; causation

• Negative association; no causation

• Positive association; no causation

Elaine collected data on the number of miles a flight travels and the cost of the plane ticket for the flight. If the correlation coefficient of Elaine's data was 0.82, which would most likely represent the scatter plot of the data?

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