7.18 Intrusion detection systems. The Journal of Research of theNational Institute of Standards and Technology (November-December 2003) published a study of a computer intrusiondetection system (IDS). The IDS is designed to provide analarm whenever unauthorized access (e.g., an intrusion) toa computer system occurs. The probability of the systemgiving a false alarm (i.e., providing a warning when no in-trusion occurs) is defined by the symbol a, while the prob-ability of a missed detection (i.e., no warning given when anintrusion occurs) is defined by the symbol 3. These symbolsare used to represent Type I and Type II error rates, respec-tively, in a hypothesis-testing scenario.a. What is the null hypothesis, Ho?b. What is the alternative hypothesis, Ha?c. According to actual data collected by the MassachusettsInstitute of Technology Lincoln Laboratory, only 1 in1,000 computer sessions with no intrusions resulted in afalse alarm. For the same system, the laboratory foundthat only 500 of 1,000 intrusions were actually detected.Use this information to estimate the values of a and ß.

The Type 1 and Type 2 errors are defined.

Answered: 7.18 Intrusion detection systems. The…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Selecting the Appropriate Inferential Test: For each of the studies below, please identify the following (or indicate N/A "not applicable" if the feature is not relevant to the design): a) Independent Variable(s) (IVs) and # of levels for any IVs (for Correlation/Regression, identify the predictor and predicted variable rather than IV and DV) b) Dependent Variable (DV) c) Scale of Measurement for the Dependent Variable: (Nominal, Ordinal, Interval, Ratio) for Correlation/Regression please make sure you identify the scale of measurement for both variables d) Appropriate Statistical Test (If it is a Factorial ANOVA, make sure to name the design: e.g., 2 X 2, 2 X 3, etc.)
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Suppose that 30 percent of an adult population have an infectious disease and 40 percent have achronic disease. Assume that having an infectious disease is independent from having a chronicdisease. For each of the questions below perform the calculation using appropriate statisticalnotation.a. What is the probability that a person selected at random will have both diseases?b. What is the probability of having the infectious disease for people with the chronic disease?c. What is the probability of having the infectious disease for people without the chronic disease?d. What is the probability of not having the infectious disease for people with the chronicdisease?
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2) A+udy is made which compares gender with smoking habits. Here are the results: Male Female Non Smoker Light Smoker 60 Heavy Smoker 250 310 70 70 40 Find these probabilities: a) P (Female / Light Smoker) b) P (Light Smoker/ Female) c) P(Male / Smoker) d) P (Male / Female) e) Are gender and smoking habits independent? Explain your answer briefly. Focus 83 12/1
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