Question 192822: 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?
Noisce level climb cruise desent row total
Low 6 2 6 14
Medium 18 3 8 29
High 1 3 14 18
Col total 25 8 28 61
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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?
Noisce level climb cruise desent row total
Low 6 2 6 14
Medium 18 3 8 29
High 1 3 14 18
Col total 25 8 28 61
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Ho: Row and Column factors are independent.
Ha: They are dependent
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Run a Chi-Sq Test on the 3x3 data set to get:
test statistic: Chi-Sq = 15.16
p-value: 0.0044
------------------------
Since the p-value is less than 5%, reject Ho.
We cannot say the row and column factors are independent.
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Cheers,
Stan H.
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