High levels of cockpit noise in an aircraft can damage the hearing of pilots who

Question

High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. Cockpit noise in a jet aircraft is mostly due to airflow at hundreds of miles per hour. This 3x3 contingency table shows 61 observations of data collected by an airline pilot using a handheld sound meter in a Boeing 727 cockpit. 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). Calculate the following probabilities: (Round your answers to 4 decimal places.) P(B) P(L) P(H/C) P(HD) P(L and B) P(L and C) Do you see evidence that noise level depends on flight phase? Yes No

Explanation / Answer

from above table

P(B)=27/61=0.4426

P(L)=13/61=0.2131

P(H|C)=3/8=0.3750

P(H|D)=12/26=0.4615

P(L and B)=4/61=0.0656

P(L and C)=2/61=0.0328

b)Yes

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