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To obtain information on the corrosion-resistance properties of a certain type of steel conduit, 45 specimens are buried in soil for a 2-year period. The maximum penetration (in mils) for each specimen is then measured, yielding a sample average penetration of xbar = 52.7 and a sample standard deviation of s = 4.8. The conduits were manufactured with the specification that true average penetration be at most 50 mils. They will be used unless it can be demonstrated conclusively that the specification has not been met. What would you conclude?
What is the probability that the sample proportion p of an SRS of size n = 1000 Who say their health is excellent lies between 26% and 32%?
Determine critical path and project completion time. Determine the probability that the project will be finished in 70 days or less. Determine the probability that the project will be finished in 80 days or less
Find the probability that a random sample of 4 male Siberian tigers will have a sample mean weight more than 450 lb.
the grade appeal process at a university requires that a jury be structured by selecting six individuals randomly from
What kinds of plots are useful in data screening? What can you do if your data do not meet the assumptions of your statistic?
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
What is the mean amount spent on insurance? If we select a family at random, what is the probability they spend less than $2,000 per year on insurance per year?
The population mean of a company's racing bicycles is 9.07 kg (20.0 lb) with a population standard deviation of 0.40 kg. If the distribution is approximately normal
explain what will happen to the width of a confidence interval increase decrease or remain the same as a result of
What terms describe the fit of a regression equation to the data? What is the practical use of the regression equation in the real world? Explain with some examples.
Calculate 95 percent and 99 percent confidence intervals for m. Using the 95 percent confidence interval, can we be 95 confident that m is at least 50 pounds? Explain.
Data analysis must be completed using a statistical software package - either Statistix for Windows, with the MegaStat add in, SPSS, SAS, R or any other legitimate software package.
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