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78 Refer to the cross-tabulation of response frequencies for 159 business statistics students who answered questions about their political views and...
5.78 Refer to the cross-tabulation of response frequencies for 159 business statistics students whoanswered questions about their political views and parent dominance on an anonymous survey.Find the following probabilities. (Note: The full 20-question survey of statistics students is inLearningStats.) Politicsa. P(L) b. P(C) c. P(M)d. P(F) e. P(C | F) f. P(C | M)5.76 High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to thishazard for many hours. Cockpit noise in a jet aircraft is mostly due to airflow at hundreds of milesper hour. This 3×3 contingency table shows 61 observations of data collected by an airline pilotusing a handheld sound meter in a Boeing 727 cockpit. Noise level is defined as “low” (under88 decibels), “medium” (88 to 91 decibels), or “high” (92 decibels or more). There are three flightphases (climb, cruise, descent). (a) Calculate each probability (i–ix) and explain in words what itmeans. (b) Do you see evidence that noise level depends on flight phase? Explain. (c) Where elsemight ambient noise be an ergonomic issue? (Hint: search the Web). (Data are from Capt. RobertE. Hartl, retired.) Cockpiti. P(B) ii. P(L) iii. P(H )iv. P(H | C) v. P(H | D) vi. P(D | L)vii. P(L and B) viii. P(L and C) ix. P(H and C)
