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A. The trees in a forest have a mean height of 39.5 feet with a standard deviation of 2.2 feet. Assuming that the distribution of these trees has roughly the shape of a normal distribution, find:
a. What percentage of the trees is less than 38 feet tall?
b. What percentage are at least 40 feet tall
c. The height above which are the tallest 30 percent of the trees.
A central university has a student population of 60,000. The university is interested in determining what proportion of them is in favour of a new grading system.
the true highway mileage y of a specific brand of hybrid vehicle has a normal distribution with a mean of 42 and a
If the company wishes to estimate, within 2 percentage points and with 99% confidence, the percentage of employees who are interested in participating in a new stock option benefits program, how large a simple random sample will be necessary?
Provide an example of an independent sample and or a related sample that might be appropriate for use in your organization.
in a study conducted by ucla it was found that 30 of college freshmen support increased military spending. if 12
Each of the machines A and B in an electronics fabrication plant produces a single batch of 50 electrical components per hour.
The report "Wireless Substitution: Early Release of Estimates from the National Health Interview Survey" (Center for Disease Control, 2009)
A sample of 25 program participants in an alcohol rehabilitation program are administered a test to measure their self-reported levels of alcohol intake
A health care professional wishes to estimate the birth weight of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 6 ounces of the sample mean?
(a) Explain under what conditions we would commit a type I error and under what conditions we would commit a type II error.
Develop a forecast for year 6, using two-year moving average and trend analysis. Identify which method is most appropriate for this data set
The sample mean of the sampling distribution of a statistic is 6 and the standard error of the statistic is 1.03. What is the probability that xbar > 7.52?
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