Directions: Show all your work. Indicate clearly the meth- ods you use, because you will be scored on the correctness of your methods as well as on the accuracy and complete- ness of your results and explanations. Do employer-sponsored wellness programs work? About 5000 employees at the University of Illinois at Urbana-Champaign volunteered for a study to find out. Researchers randomly assigned 3300 volunteers to a treat- ment group and the remaining 1534 to a control group. Employees in the treatment group were invited to take paid time off to participate in a wellness program. Those in the control group were not allowed to participate. One mea- sure of the program's effectiveness was employee attrition