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A flight is said to be on time if it lands within 15 min. of its published...

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Basic Math

Aflight is said to be on time if it lands within 15 min. of itspublished arrival.
a.) What is the minimum sample size needed to be 95% confidentwithin 2 percentage points of the actual proportion of on-timeflights?
b) A recent study of 150 flights found that 84% of SouthwestAirlines flights arrive on time. Rounding to the nearest tenth of apercent, we can say with 95% confidence that the proportion ofsoutwest flights that arrive on time is between ____ and ____ witha margin of error ____.

Answer & Explanation Solved by verified expert
3.8 Ratings (511 Votes)
Solution Given thata 051 05margin of error E 002At 95 confidence level the z is 1 95 1 095 005 2 005 2 0025Z2    See Answer
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