A study of nonfatal occupational injuries in the United States found that about

Question

A study of nonfatal occupational injuries in the United States found that about 31% of all injuries in the service sector involve the back. The NIOSH recommended conducting a comprehensive ergonomics assessment o jobs and work stations. Mark Glassmeyer developed a unique ergonomic handcart to help field service engineers be more productive and equipment during service calls. Using a sample of 382 field service engineers who were provided with the carts, the following data was collected. average call time without cart 8.27 hours first year, with cart year 2 7.98 hours. Standard deviation call time year 1 without cart 1.36 hours, year 2 with cart 1.21 hours. Proportion of back injuries 0.018 year 1 without cart, with cart year 2 0.010. Find 95% confidence intervals for the average call time and proportions of back injuries in each years.

Explanation / Answer

Find 95% confidence intervals for the average call time and proportions of back injuries in each years.

alñpha / 2 = 0.025    Z = 1.96

I: 8.27 +/- 1.96 * 0.018

8.27 +/- 0.035

8.335 < miu < 8.305

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