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High level of cockpit noise in an aircraft can damage hearing of pilots who are exposed to this hazard for many hours. A B
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Question 133509: Question, please help! On line course, No ISBN provided.
High level of cockpit noise in an aircraft can damage hearing of pilots who are exposed to this hazard for many hours. A Beoing 727 co-pilot collected 61 noise observations using a handled sound meter. Noise level is defined as "low (under 88 decibles), Medium (88 to 91), high (92 or more). There are three flight phases (Climb,Cruise,Descent). At alph=.05, is the cockpit noise level independent of flight phase? State hypothesis, show degrees of freedom, find critical value of chisquare, and interpret p=value.
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
Thank you!
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
High level of cockpit noise in an aircraft can damage hearing of pilots who are exposed to this hazard for many hours. A Beoing 727 co-pilot collected 61 noise observations using a handled sound meter. Noise level is defined as "low (under 88 decibles), Medium (88 to 91), high (92 or more). There are three flight phases (Climb,Cruise,Descent). At alph=.05, is the cockpit noise level independent of flight phase?
State hypothesis
Ho: noise and flight phase are independent
Ha: they are dependent
--------------------------
show degrees of freedom
(# of rows -1)(# of columns -1) = (2)(2) = 4
--------------------------
find critical value of chisquare
Chi-Sq critical values for 2-tail Chi-Sq. Test: 0.484 and 11.143
--------------------------
interpret p=value
p-value is 0.0044
Only 0.0044 of test results would show stronger evidence for rejecting Ho.
Since p-value is less than 5%, reject Ho.
-----------------------------------
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
---------------------
Cheers,
Stan H.
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