The Journal of Research of the National Institute of Standards and Technology (November-December 2003) published a study of a double intrusion detection system with independent systems. If there is an intruder, system A sounds an alarm with probability .9, and system B sounds an alarm with probability .95. If there is no intruder, system A sounds an alarm with probability .2, and system B sounds an alarm with probability .1. Now assume that the probability of an intruder is .4. Also assume that under a given condition (intruder or not), systems A and B operate independently. If both systems sound an alarm, what is the probability that an intruder is detected?

Statistics for Business and Economics

13th edition

Authors: James T. McClave, P. George Benson, Terry Sincich

ISBN: 978-0134506593

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