Chi-square by using independence

Reference no: EM1314994

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 (Climb, Cruise, Descent). Research question: At α = .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
Col Total	25	8	28	61

Reference no: EM1314994

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