Noise level independent of flight phase

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Reference no: EM1317880

High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. A Boeing 727 co-pilot collected 61 noise observations using a handheld sound meter. Noise level is defined as "Low" (under 88 decibels), "Medium" (88 to 91 decibels), or "High" (92 decibels or more). There are three flight phases. At α = 0.05, is the cockpit noise level independent of flight phase?

Noise Level	Climb	Cruise	Descent	Row total
Low	6	2	6	14
Medium	18	3	8	29
High	1	3	14	18
Column total	25	8	28	61

Reference no: EM1317880

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