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A construction company is designing the world's highest commercial building at the Michigan Avenue in Chicago. In order to support the gigantic structure, its civil engineering team needs to develop strong concrete foundation. The team recently synthesized a new concrete mixture which compressive strength is normally distributed with mu=30000psi and sigma=6000psi. Find the probability that a random sample of n=20 specimens will have a sample mean compressive strength that falls in the interval from 27000 to 31500 psi.
in a test of the effectiveness of garlic for lowering cholesterol 42 subjects were treated with garlic in a processed
Tthen calculate the 95% and 99% CIs for the proportion of all female Hispanic drivers in Boston who wear seatbelts. Why is the 99% CI wider than the 95% CI?
The experimental medication of the placebo. Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups.
three years ago the mean price of a single-family home was 243800. a real estate broker believes that the mean price
in a few sentences can you explain why is it important to be able to translate reported findings for research studies
A report states that 73% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.03 with 98% confidence?
in our example of research on lipstick where e 2 and s 29 what sample size would we require if we desired a 99
a researcher was interested in determining whether incentives and how they were offered affected the response rate in
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
A railway company operates a number of different services. One of these connects two cities and the journey time is assumed to be normally distributed with a mean of 125 minutes and a standard deviation of 5 minutes.
so if you have a variance of 75 for a class average with a standard deviation of - 15. what grade will 96 of the class
A test statistic is computed from sample data in hypothesis testing and is used in making a decision about whether or not to reject the null hypothesis. True or False
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