Concept explainers
Detecting a computer virus attack. Chance (Winter 2004) presented basic methods for detecting virus attacks (e.g., Trojan programs or worms) on a network computer that are sent from a remote host. These viruses reach the network through requests for communication (e.g., e-mail, Web chat, or remote log-in) that are identified as “packets.” For example, the “SYN flood” virus ties up the network computer by “flooding” the network with multiple packets. Cybersecurity experts can detect this type of virus attack if at least one packet is observed by a network sensor. Assume that the probability of observing a single packet sent from a new virus is only .001. If the virus actually sends 150 packets to a network computer, what is the probability that the virus is detected by the sensor?
Want to see the full answer?
Check out a sample textbook solutionChapter 4 Solutions
Statistics for Business and Economics (13th Edition)
Additional Math Textbook Solutions
Elementary Statistics Using The Ti-83/84 Plus Calculator, Books A La Carte Edition (5th Edition)
Intro Stats, Books a la Carte Edition (5th Edition)
Basic Business Statistics, Student Value Edition
Elementary Statistics: Picturing the World (7th Edition)
Introductory Statistics (2nd Edition)
The Practice of Statistics for AP - 4th Edition
- Explain how you can determine the steady state matrix X of an absorbing Markov chain by inspection.arrow_forwardcan you please do part d and e , please provide explanationsarrow_forwardGiven this two-component system and associated independent events: OP(A) + P(B) Which of the following represent the system Reliability? OP(A) + P(B) - P(ANB) P(ANB) A P(AUB) B Event A: component A survives to time t Event B: component B survives to time tarrow_forward
- Scenario: A researcher wants to study the effects of childhood stress, genetics, and their interaction for predicting aggression in adults. The researcher recruited 40 subjects, 20 reported they had no childhood stress and 20 reported they experienced severe childhood stress. The researcher is specifically interested in looking at the MAOA gene, because different versions of this gene are linked to aggression. The researcher conducts a genetic test and finds that half of subjects in each group have a gene for low MAOA activity and the other half have the gene for high MAOA activity. The researchers have the subjects self-rate their aggressive behavior over the last 6 months. 1. Given the scenario above, what are the null and alternative hypotheses? 2. Experimental design:a. What are the independent and dependent variables in this study? b. How many levels of each independent variable are there? c. What type of factorial ANOVA is this?arrow_forwardA system consists of five components, each can be operational or not. Each day one operational component is used and it will fail with probability 20%. Any time there no operational components at the end of a day, maintenance will be performed and all non-operational components will be repaired (with probability 1). The system does not perform any other tasks on the day of repairs. Model the system as a Markov chain Write down equations for determining long-run proportions. Suppose that you are interested in the average number of days that the system is under repair. Explain how you would find it using your model.arrow_forwardAn educational psychologist is concerned about the effect of test anxiety on exam performance. The psychologist selects a random sample of 4 people who report suffering from extreme test anxiety and asks them to read and study a chapter of a textbook. After 3 hours of study time, they are given a 10 question quiz on the material. Then, the participants are given a course on relaxation techniques (e.g. deep breathing exercises, positive visualization training, etc.). After the course, the participants are given another 3 hours to read and study a chapter in a textbook and then they are given another 10 question quiz on the material (half of the participants received one chapter/quiz first and the other half received the other chapter/quiz first). The participants were encouraged to utilize the relaxation techniques they had learned in the course while taking the quiz. Use the data collected in the following table to determine if there is sufficient evidence at the 1% level of…arrow_forward
- An industrial engineer is investigating the effect of four assembly methods (A, B, C, D) on the assembly time for a color television component. Four operators are selected for the study. Furthermore, the engineer knows that each assembly method produces such fatigue that the time required for the last assembly may be greater than the time required for the first, regardless of the method. That is, a trend develops in the required assembly time. To account for this source of variability, the engineer uses the Latin square design shown below. Analyze the data from this experiment ( = 0.05) draw appropriate conclusions by conducting hypothesis testing. Order of Operator Assembly 1 2 3 4 1 C=10 D=14 A=7 B=8 2 B=7 C=18 D=11 A=8 3 A=5 B=10 C=11 D=9 4 D=10 A=10 B=12 C=14arrow_forwardCentral topic markov chains: Every summer the Yates de los Lagos owners association decides if its annual regatta will be held in June, July or August. If it takes place in June, the probability of good weather is ¾; and if these conditions exist, the regatta of the next year it will be done in June with probability 2/3, in July with probability 1/6 or in August with probability 1/6; but if there is bad weather, next year's regatta will take place in July or August with equal probabilities. If the competition is held in July, good and bad weather have equal probabilities; if there is good weather, the next year's regatta will be held in July; If there is bad weather, the next regatta will take place in August with probability of 2/3 or in June with probability of 1/3. If the regatta takes place in August, the probability of good weather is 2/5; and if there are good conditions atmospheric conditions, next year's regatta will take place in July or August, with equal probabilities; but…arrow_forwardFor a parallel structure of identical components, the system can succeed if at least one of the components succeeds. Assume that components fail independently of each other and that each component has a 0.08 probability of failure. Complete parts (a) through (c) below. ..... (a) Would it be unusual to observe one component fail? Two components? It be unusual to observe one component fail, since the probability that one component fails, is than 0.05. It be unusual to observe two components fail, since the probability that two components fail, is than 0.05. (Type integers or decimals. Do not round.) (b) What is the probability that a parallel structure with 2 identical components will succeed? (Round to four decimal places as needed.) (c) How many components would be needed in the structure so that the probability the system will succeed is greater than 0.9998? (Type a whole number.) Time Remaining: 02:38:20 Next MacBook Pro 888 OOD F7 FB F10 F5 F6 F4 24 3 4 6 eft ERarrow_forward
- For a parallel structure of identical components, the system can succeed if at least one of the components succeeds. Assume that components fail independently of each other and that each component has a 0.22 probability of failure. Complete parts (a) through (c) below. ..... (a) Would it be unusual to observe one component fail? Two components? It be unusual to observe one component fail, since the probability that one component fails,, is than 0.05. It be unusual to observe two components fail, since the probability that two components fail, , is than 0.05. (Type integers or decimals. Do not round.) (b) What is the probability that a parallel structure with 2 identical components will succeed? (Round to four decimal places as needed.) (c) How many components would be needed in the structure so that the probability the system will succeed is greater than 0.9999? (Type a whole number.) DEC 16 étv J 280 MacBook Air 80 DII F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 公8arrow_forwardMany animals, including humans, tend to avoid direct eye contact and even pattern that look like eyes. Some insects, including months, have involved eye-spot pattern in their wings to help ward off predators. Scalfe (1976)reports a study examining how eyes spot patterns effect the behavior of birds. In the study birds were tested in a box with two chambers and were free to move from one chamber to another. In one chamber, two large eyes spot were painted on one wall. The other chamber to another. The researcher recorded the amount of time each bird spend in the plain chamber during a 60-minutes session. Suppose the study produced a mean of M=34.5 minutes in the plain chamber with SS=210 for a sample of n=15 birds ( Note if the eyes spots have no effect, then the birds should spend and average of µ=30 minutes in each chamber.) A) Is this sample sufficient to conclude that the eyes -spot have significant influence on the birds behaviors? Use a two- Tailed test with α=.05 Compute the…arrow_forwardFor a parrallel structure of identical components the system can succeed if one of the component succeeds. Assume that the components fail independently of each other and that each component has a 0.11 probability of failure. a.) would it be unusual to observe one component fail? it ____ be unusual to observe one component fail since the probability that the component fails, ___ is ___ than 0.05. It ___ be unusual to observe two components fail since the probability that two components fail __ is __ than 0.05 b.) what is the probability that a parrallel structure with 2 identical components will succeed? c.) how many components would be needed in the structure so that the probability the system will succeed is greater than 0.9999?arrow_forward
- Elementary Linear Algebra (MindTap Course List)AlgebraISBN:9781305658004Author:Ron LarsonPublisher:Cengage Learning