A social scientist measures the relationship between computer use (in hours per day) and daily exercise (in minutes per week). Answer the following questions based on the results provided.
Computer Use _________________________ Daily Exercise
3 ....................................................... 80
2 ....................................................... 60
5 ....................................................... 95
4 ....................................................... 75
(a) Compute the Pearson correlation coefficient.
(b) Add 2 hours to each measurement of Internet use and recalculate the correlation coefficient.
(c) Subtract 10 minutes from each measurement of daily exercise and recalculate the correlation coefficient.
(d) True or false: Adding and subtracting a constant to one set of scores (X or Y) does not change the correlation coefficient. Note: Use your answers in (a) to (c) to answer true or false.