A research worker wants to determine the mean time it takes a mechanic to rotate the tires of a car, and she wants to be able to assert with 95% confidence that the average of her sample is off by at most 0.50 minutes. If she can presume from past experience that σ2 = 2:56 minutes, how large a sample will she have to take?

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter9: Counting And Probability
Section9.3: Binomial Probability
Problem 2E: If a binomial experiment has probability p success, then the probability of failure is...
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A research worker wants to determine the mean time it takes a mechanic to rotate the tires of
a car, and she wants to be able to assert with 95% confidence that the average of her sample is
off by at most 0.50 minutes. If she can presume from past experience that σ2 = 2:56 minutes,
how large a sample will she have to take?

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