A researcher measures the relationship between the number of interruptions during a class and time spent "on task" (in minutes). Answer the following questions based on the results provided.

Number of Interruptions Time Spent "On Task"

10 17

5 39

7 17

3 30

a. How do I compute the Pearson correlation coefficient. (Round your answer to three decimal places.)

b. How do I multiply each measurement of interruptions times 3 and recalculate the correlation coefficient. (Round your answer to three decimal places.)

c. How do I divide each measurement in half for time spent "on task" and recalculate the correlation coefficient. (Round your answer to three decimal places.)