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homework 10

# homework 10 - Statistics Prof Giuseppe Arbia 10th homework...

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Statistics NYU - Spring 2012 Prof Giuseppe Arbia V31 0018 – 001/ V31 0018 006 10 th homework Thursday April 5 th 2012 Answer each of the questions Read the questions carefully and keep your answers brief and to the point PLEASE WRITE NEATLY Please leave your homework in the mailbox of your respective Teaching Assistant by Tuesday at 8:00am Since the homework will be discussed during the Lab sessions, no late homework can be accepted Good work ! Question 1 Before launching a new online service, a bank is interested in estimating the percentage of customers that are potentially interested in the new service. In particular the bank wants to derive the confidence interval, at 90 % of confidence, for such a proportion with a maximum error of ± 0.05 (± 5 %) with respect to the true population proportion. How many customers should be included in a sample? Quesito 2 It is given a population X normally distributed with unknown mean μ and known standard deviation = 0.012 i)

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