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Men's weights are normally distributed with a mean of 172 lb and a standard deviation of 29 lb (based on data from the National Health Survey). You need to design an elevator for the Westport Shopping Center, and it must safely carry 16 people. (We will assume that the heaviest scenario would be 16 men.) Find the maximum total allowable weight if you want a 0.975 probability that this maximum will not be exceeded when 16 males are randomly selected.
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49.
A product is made up of two subsystems in parallel. Subsystem one consists of ten elements in series each with a failure rate of 1/100. The second subsystem consists of 5 elements in series each with a failure rate of 1/200. What is the overall re..
A state education agency designs and administers high school proficiency exams. Historically, time to complete the exam was an average of 120 minutes.
From the following information for Alfred Industries compute the overhead spending variance and the volume variance:
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Looking for a good original (yet cited) response to this definition. And if you can describe two common ones with an example for each that would be great.
A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.
The Niko electronics company just manufactured 5000 CDs, and 3% are defective. If 10 of these CDs are randomly selectedd for testing, what is the proability tha the entire batch is will be rejected.
The amount of money spent by a customer is uniformly distributed over (0,100). Find the mean and variance of the amount of money that the store takes on a given day.
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
The company believes that it averages about the same weight per bag in each of two production lines. To test this idea, they will perform a hypothesis test to compare the two lines at the alpha level of 0.05. State the null and alternative hypothe..
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