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Biology and Environmental Science
Piers on public beaches are usually supported by widely spread piles or pillars and can extend a thousand feet into the ocean. Many piers are extensions of boardwalks, and visitors frequently fish or simply sightsee along these walkways. Longer piers tend to be more susceptible to wind and storm damage. Independent random samples of concrete and wooden piers on public beaches along the California and Florida coasts were obtained and the length (in feet) of each was recorded.
Assume the underlying populations are normal, with equal variances. Is there any evidence to suggest that the population mean pier length in California is greater than the population mean pier length in Florida? Use a = 0.01.
The 5 number summary of the fastest ever driven speed (mph) of penn state students is 55, 95, 110, 120 and 150. The speed that separates the bottom 25% from the top 75% is...55, 120, 110, 95?
Suppose that network breakdowns occur randomly and independently of each other on an average rate of three per month. (a) What is the probability that there will be just one network breakdown during December? Interpret.
Conduct appropriate descriptive statistical analysis, using selected software, for the given data (include appropriate graphs, if possible). Ensure you include screen shots of the MS Excel analysis.
Please identify a research question that can be addressed with a hypothesis test. An example might be to identify the presence of bacteria in a batch of milk.
Determine the probability that none of the calculators will be defective?
There is enough evidence at a significance level of 10%, to conclude that the content average sodium this brand of corn flakes is 130 milligrams?
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?
an urn contains four red balls seven black balls and five green balls. if two balls are selected at random without
Assume that the dollar is presently weak and is expected to strengthen over time. How will these expectations affect the tendency of U.S. investors to invest in foreign securities?
Suppose that X is a normally distributed random variable with mean 10 and variance 25and we take a simple random sample of size 3 and defineW = 0.4X1 + 0.3X2 + 0.2X3.Find P(W > 12)
Quarterly customer surveys are taken at a medical center. Each individual department has scores and is comparted to the medical center average. Department of Physical Therapy had scores of 9.14, 9.19 and 7.75 for quarters 1-3 respectively.
Consider a follow-up study focusing on the latest calendar year. What sample size is needed to estimate the population proportion of Australian consumers who are trying to save on gas and electricity expenditure to within 2 percentage points with ..
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