A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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The Chief Information Officer (CIO) at Old Dominion University –ODU- is trying to improve the university’s information network security. The CIO is trying to evaluate a new intrusion detection technology in the market for a possible replacement for the existing system. An intrusion detection system sounds an “alarm” each time possible malicious attack on a network is detected. The following information is provided:
Evidence, B, is intrusion detection system setting off due to anomalous traffic
For the currently installed system, the probability of an alarm given that there is an attack is 0.9, while the probability of an alarm given there is no attack is 0.25.
For the new technology, the probability of an alarm given that there is an attack is 0.8, while the probability of an alarm given there is no attack is 0.1.
The CIO assumes that there are only two types of events: either there is, or there is no attack.
The CIO is using “evidence ratio,” described as P(B|A) / P(B|A’) as a way to compare the technologies. Please help the CIO compare the new technology with the currently installed system by answering the following questions:
What is evidence ratio for the currently installed system?
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