# Statistics - Hypothesis Test Chi Square Test

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). Use α = .05

Research Question: Is the cockpit noise level independent of flight phase?

Noise Level Climb Cruise Decent Row Total

Low 6 2 6 14

Medium 18 3 8 29

High 1 3 14 18

Column Total 25 8 28 61

A. Choose the Hypothesis

Ho:

H1:

B. Specify the Decision Rule

C. Calculate the Test Statistic

D. Make the Decision. Where the Chi-Square assumptions met?

E. Give an interpretation of the Decision

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#### Solution Summary

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