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Question: Investigators are studying two drugs used to improve the FEVl readings (a measure of lung function) in asthmatic patients. Assume that σ = .8 and the difference in means they wish to detect is .25. If they want to do a two-sided test of equal population means with a = .05 and β = .20, what sample size should they use?
Write an explanation to such a person about how polls can get a good idea of how the entire population will vote by asking a relatively small number of voters.
Determine the probability that the project will be completed in 80 days or less.
A random sample of 32 bottles is selected, and the mean amount of water per 1 gallon can is found to be 0.995 gallon. Calculate the test statistic.
If you require an 11% nominal yield to maturity on this investment, what is the maximum price you should be willing to pay for the bond?
Of 346 vending machines tested, 12 are found to be defective. Construct the 98 % confidence interval for the proportion of all defective vending machines.
Describe the organization, with a brief description. Identify what variable would be best to measure for this problem and explain why?
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
Problem: Screening for infectious diseases in a blood-bank setting is a major part of ensuring blood safely. At a local clinic, subject's blood donations are tested for infection. Suppose that 5 percent of all blood donations are infected n some w..
Two 12-man teams of Marines were randomly selected from Marine Corps Air Stations Miramar and Yuma to be compared on their Combat Fitness Test.
in a certain noisy factory workers are provided with earplugs and are expected to wear them. an industrial hygienist
$600 (1 chance in 4800); $200 (1 chance in 2500). Find the expected value of the amount won for one entry if the cost of entering is 52 cents.
1. Develop histograms showing the distribution of rivet diameters from the original and new supplier. 2. Compute the sample means and standard deviations for the two sets of data.
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