Question: Using the PhStat, solve the following: A study of nonfatal occupational injuries in the United States found that about 31% of all injuries in the

Using the PhStat, solve the following:

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
The proportion of back injuries	0.018	0.01

Determine if there is statistical evidence that the proportion of back injuries has decreased as a result of using the cart.

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