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Medicine and Clinical Studies
The diameter of a virus is approximately 0.3 mm (micrometers). There is some speculation that new virus strains exhibit greater variability in diameter. A medical research lab obtained a random sample of 15 new virus strains and measured the diameter (in mm) of each. The sample mean diameter was 0.323 and the sample variance was s2 = 0.0026. Is there any evidence to suggest the true population variation in diameter of viruses has increased from 0.0015? Assume normality and use a = 0.05.
70% of the girls surveyed had used an online social network, compared to 54% of the boys. What does it mean to say that the difference in proportions is significant?
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
Ken believes that the $300,000 figure for the Sub 100 with a favorable market is too high. How much lower would this figure have to be for Ken to change his decision made in part (b)?
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10-year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excess..
Find a 95% confidence interval for the true proportion of patients who experienced cotton mouth. Show your calculations and/or explain the process used to obtain the interval.
Assuming normality, find 99% confidence interval for true mean response time for rural-area ambulances.- Assuming normality, find a 99% confidence interval for the true mean response time for city ambulances.
The length of human pergnancies is aprox normally distibuted with a mean of 266 days and a standard devation of 16 days what is the probability the pregancy will last between 160 and 255 days?
Assume these data constitute a random sample of such funds, and use them to test the claim that the average world stock fund made more than 25% for its investors during this period.
Brooke can expect a different grade in each of thecourses, depending on who teaches it next quarter. Determine the best course to take next quarter, using the following criteria Maximax.
a corporation has 11 manufacturing plants. of these 7 are domestic and 4 are located outside the united states. each
Let x1,..., x16 be an independent sample from a normal distribution N(μ, 5). For the following test problem: Ho: μ = 6.5 ↔Ha: μ ≠6.5, let the rejection region be W = {|x-6.5| ≥ c}, If μ = 7.5 is correct, find the probability of the second type erro..
If these values are removed, do you think the mean will increase, decrease, or remain the same? What about the standard deviation? Explain.
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