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Cybersecurity is an area of increasing concern. The National Security Agency (NSA) monitors the number of hits at sensitive Web sites. When the number of hits is much larger than normal, there is cause for concern and further investigation is warranted. For the past twelve months the number of hits at on such Web site has been: 181, 162, 172, 169, 185, 212, 190, 168, 190,191, 197, and 204. Determine the upper and lower control limits (99.7%) for the associated c-chart. Using the upper control limit as your reference, at what point should the NSA take action?
1. you manage a loan portfolio at a local bank. one day you are approached by a jim riskind who is seeking an unsecured
Develop a 98 percent confidence interval for the population mean. Would it be reasonable to conclude that the population mean is $350 per month?
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
The quality control manager at a light globe factory needs to estimate the mean life of large shipment of energy-saving compact light globes. The historical standard deviation of light globe life is 250 hours. A random sample of 64 light globes..
What is the probability that a simple random sample of automobile insurance policies will have a sample mean within 25 of the popluation mean.
The data presented in the table below resulted from an experiment in which seeds of 5 different types were planted and the number of seeds that germinated within 5 weeks after planting was recorded for each seed type.
Morality Study for a group of four men, the probability distribution for the number x who live through the next year is as given in the accompanying table.
Determine percentage of boys in this age range have carbohydrate intake above 140g/1000cal and carbohydrate intake below 90g/1000cal?
College graduates, and half of the college graduates are married. What is the probability that a randomly chosen worker is: Neither married nor a college graduate?
In an exam, the mean score is 70 and the variance is 16. What is the probability that a student's score will lie within the "54 to 86" range?
an environmental group is interested in studying the effects of engine size cubic inches on the gas mileage of cars
Give 99% confidence interval for mean number of years general managers of major-chain hotels have spent with their current company.
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