An article on the BBC website states that of more than 25 billion e-mail messages monitored by

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An article on the BBC website states that of more than 25 billion e-mail messages monitored by the company Symantec, 46.4% were classified as junk (“Spam email levels at 12-year low,” www.bbc.com, July 17, 2015). Suppose a company installed a new system for identifying junk messages and then diverting them to the spam folder. A random sample of 1,000 incoming messages was selected, and of these, 488 were declared to be junk. If we assume that the 46.4% figure is the true percentage, then based on the sample data, does it look like this company receives a higher proportion of junk messages than the population in general? Test using an alpha = 0.01 level.

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Business Statistics A Decision Making Approach

ISBN: 9780134496498

10th Edition

Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry

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