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1. Let X1,..., Xn be a random sample from an exponential distribution with parameter θ. A sample of 350 observations from this population has a mean equal to 3.75. Construct a 90% con?dence interval for θ.
2. Suppose the population is women at least 35 years of age who are pregnant with a fetus affected by Down syndrome. We are interested in testing positive on a noninvasive screening test for fetuses affected by Down syndrome in women at least 35 years of age. In an experiment, suppose 52 of 60 women tested positive. Obtain a 95% con?dence interval for the true proportion of women at least 35 years of age who are pregnant with a fetus affected by Down syndrome who will receive positive test results from this procedure.
birthweights at a local hospital have a normal distribution with a mean of 110 oz. and a standard deviation of 15 oz.
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
We have been informed that the stock has gone up 20%. What is the probability of a rise or fall in the GDP?
consider your study terrorism ideology and perception of national security strategies by local police conduct a mock
the average age for licensed drivers in a county is micro 42.6 ? 12 and the distribution is approximately normal. a
Measures of Central Tendency
The number of nonconforming springs in a batch,denoted as X, is a binomial random variable.
a company that produces a particular machine component has 3 factories one each in buffalo detroit and pittsburgh. 27
question past records show that the mean life of a certain brand of batteries used in a digital clock is 305 days.
when comparing your district average to the state average what is the appropriate test of the hypothesis that your
questiona it is noted that 8 of kaplan students are left handed. if twenty 20 students are randomly selectednbsp
An interval from 0 to 90 minutes what is the probability that the line interval between two consecutive defective lights will be less than 10 minutes.
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