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A system has two failure modes. One failure mode due to external conditions, has a constant failure rate of 0.07 failure per year. The second attributed to wearout, has a Weibull distribution with a characteristics life of 10 year and a shape parameter of 1.8. Determine the system reliability for a design life of 1 year. Find by trial and error the median time of failure.
in a survey of undergraduate library usage it was found that 76 of seniors 59 of juniors 50 of sophomores and 28 of
Determine the appropriate descriptive statistics. For normally distributed data use the mean and standard deviation. For significantly skewed data use the median and interquartile range.
A federal report find that a lie detector test given to truthful persons have a probability of 0.2 of suggesting that the person is deceptive. A company asks 12 job applicants to take a lie detect test. Suppose that all 12 applicants answer truthf..
the theoretical probability of undesirable side effects resulting from taking grebex is 2 in 19. if 570 people take
Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval and discuss why they are different.
Predict the average age difference in 2015.- Describe reasons why you might not place much faith in that prediction.
waiters at finegolds restaurant and lounge earn most of their income from tips. each waiter is required to tip-out a
For a sample of 11 independent observations from a normal distribution of unknown μ and unknown variance σ 2 , the sample mean is 74.6 and sample variance is 2.2. What is the lower point of the 90% confidence interval for μ?
which of the following sampling procedures represents non-probability sampling?a. the researcher obtains a sample of
Number of rescue calls received by rescue squad in city follows a Poisson distribution with mu = 2.83 per day. Squad can handle at most four calls a day. Determine the probability that squad will be able to handle all calls on a particular day?
Molded fiberglass parts are to be tested for defectives. Two different grades of fiberglass were used for the parts, and one is interested in testing for a difference in the proportions defective using a: = 0.05.
a poll of 1000 americans reported that 42 expect to inherit money from their parents. what is the 99 confidence
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