A personnel manager for a large corporation feels that there may be a relationship between absenteeism and age and would like to use the age of a worker to develop a model to predict the number of days absent during a calendar year. A random sample of 10 workers was selected with the results presented below:
Age Days Absent
27 15
61 6
37 10
23 17
46 9
58 7
28 13
36 11
64 5
40 7
What is the correlation coefficient?