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
|