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You take a random sample of size 100 from a normal population with unknown mean but known standard deviation 40. You plan to test H(null): mu=85 versus H(alternative): mu > 85. Your procedure will be to observe the sample then reject H(null) is xbar>90.a.) What is the probability of rejecting the null if in fact mu=95?b.) What is the Type II error and what is the power of the test if in fact mu=95?
Tim is a plumber who joined a barter club. This year Tim exchanges plumbing services for a new roof. The roof is properly valued at $2,500, but Tim would have only billed $2,200 for the plumbing services. What amount of income should Tim reco..
How do small companies compare to the major competitor and Has satisfaction with the manufacturer changed since the change in company ownership?
Facebook CEO Mark Zuckerberg recently announced that it would be going public. The usual suspects, Morgan Stanley, JPMorgan Chase, and Goldman Sachs will be the lead underwriters. When Facebook was choosing underwriters, they were made varying..
Plain old Monty Hall
Determine the number of stores that must be sampled in order to estimate the true proportion to within 0.05 with 95% confidence using the large-sample method.
A survey of people in Iowa showed that 40 out of 400 prefer watching TV comedy shows. Another survey in Colorado showed that 90 out of 600 prefer watching TV comedy shows. At a 1% significance level, would it seem that the true proportions of p..
Identify sample, population, sampling frame (if applicable), and response rate (if applicable). Describe sampling technique (if applicable) or experimental design
What are the key issues in health care right now? How is research used-or how could it be used-in each of these areas by health care organizations?
(1 point) According to data from the Tobacco Institute Testing Laboratory, a certain brand of cigarette contains an average of 1.4 milligrams of nicotine. An advocacy group questions this figure, and commissions an independent test to see if the the ..
Statistics from Cornell's Northeast Regional Climate Center indicate that Ithaca, NY, gets an average of 35.4" of rain each year with a standard deviation of 4.2". Assume the data is normally distributed.
Researcher wants to determine whether high school students who attend an SAT preparation course score significantly different on the SAT than students who do not attend the preparation course. For those who do not attend the course,
Explain the methodology you will use to answer the question you posed. Your explanation should include answers to the questions - What is the variable of interest?
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