High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. Cockpit noise in a jet aircraft is mostly due to airflow at hundreds of miles per hour. This 3 × 3 contingency table shows 61 observations of data collected by an airline pilot using a handheld sound meter in a Boeing 727 cockpit. Noise level is defined as "low" (under 88 decibels), "medium" (88 to 91 decibels), or "high" (92 decibels or more). There are three fight phases (climb, cruise, descent).

(a) Calculate each probability (i­vi) and explain in words what it means.

(b) Do you see evidence that noise level depends on fight phase? Explain.

i. P(B)

ii. P (L)

iii. P(H | C )

iv. P(H | D)

v. P(L and B)

vi. P(L and C )

Transcribed Image Text:

Cockpit Noise Flight Phase Cruise (C) Descent (D) Row Totl Noise Level Low d) Medium (M High (H) Climb (8) 6 14 29 18 61 18 14 28 Column Total 25 8