18. A study of nonfatal occupational injuries in the United States found that about 31% of all injuries in the service sector involved the back. The National Institute for Occupational Safety and Health (NIOSH) recommended conducting a comprehensive ergonomics assessment of jobs and workstations. In response to this information, Mark Glassmeyer developed a unique ergonomic handcart to help field service engineers be more productive and also to reduce back injuries from lifting parts and equipment during service calls. Using a sample of 382 field service engineers who were provided with these carts, Mark collected the following data:

Year 1 (Without Cart) Year 2 (With Cart)

Average call time 8.05 hours 7.84 hours Standard deviation call time 1.39 hours 1.34 hours Proportion of back injuries 0.018 0.010 Find 95% confidence intervals for the average call times and proportion of back injuries in each year. What conclusions would you reach based on your results?