An intrusion detection system (IDS) is designed to provide an alarm whenever unauthorized access to a computer system occurs. The probability of the system giving a false alarm is defined by the symbol alphaα, while the probability of a missed detection is defined by the symbol betaβ. 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, H0? b. What is the alternative hypothesis, Ha?
c. According to a college research laboratory, only 33 in 3 comma 0003,000 computer sessions with no intrusions resulted in a false alarm. For the same system, the laboratory found that only 400400 of 2 comma 0002,000 intrusions were actually detected. Use this information to estimate the values of alphaα and betaβ.