7.18 INTRUSION DETECTION SYSTEMS. The Journal of Research of the National Institute of Standards and Technology (November-December 2003) published a study of a computer intrusion detection system (IDS). The IDS is designed to provide an alarm whenever unauthorized access (e.g., an intrusion) to a computer system occurs. The probability of the system giving a false alarm (i.e., providing a warning when no intrusion occurs) is defined by the symbol a, while the probability of a missed detection (i.e., no warning given when an intrusion occurs) is defined by the symbol 3. These symbols are used to represent Type I and Type II error rates, respectively, in a hypothesis-testing scenario. a. What is the null hypothesis, Ho? b. What is the alternative hypothesis, Ha?
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