15.24 High levels of cockpit noise in an aircraft candamage the hearing of pilot

Question

15.24High levels of cockpit noise in an aircraft candamage the hearing of pilots who are exposed tothis

hazard for many hours. A Boeing 727 co-pilotcollected 61 noise observations using ahandheld

sound meter. Noise level is defined as“Low” (under 88 decibels), “Medium” (88 to91 decibels),

or “High” (92 decibels or more).There are three flight phases (Climb, Cruise,Descent). Research

question:At = .05, is the cockpit noise level independent offlight phase? (Data are from

Capt. Robert E. Hartl,retired.) Noise

Noise Level Climb Cruise Descent RowTotal

Low 6 2 6 14

Medium18 3 8 29

High 1 3 14 18

Col Total25 8 28 61

Explanation / Answer

Ho: row and column factors are independent Ha: they are not -------------- Run a Chi-Sq Test of independence on the 3x3 set of data Test statistic: 15.16013 p-value: 0.00438 df = 2*2 = 4 Conclusion:Since p-value is less that 1%, reject Ho. row and column factors are dependent; noise depends on flight level

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