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Several investigators have studied relationship between asbestos exposure and death from chronic obstructive pulmonary disease (COPD).
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 death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
At the .05 significance level, is there a difference in the mean number of miles traveled per month between Cincinnati and Pittsburgh employees? Use the five-step hypothesis-testing procedure.
The data in the next table resulted from an experiment that used a completely random design. Test the null hypothesis that u1 = u2 = u3, where ui represents the true mean for treament i, against the alternative that at least two of the means differ..
In teaching the role of statistical application in Health Science, the importance of reliable and valid data is very critical in research process.
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2011. The following data were measured. Compute the sample standard deviation.
A store has an average of 25 people arriving each minute to checkout and each person on the average require 4 minutes to be processed at the checkout. What is the minimum number of cashiers required?
Calculate a 95% confidence interval for the mean endowment of all the private colleges in the United States assuming a normal distribution for the endowments.
The contingency table below shows the results of a random sample of 200 state representatives that was conducted to see whether their opinions on a bill are related to their party affiliation
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
Suppose that you wish to perform a nonparametric test for a difference among the medians of three or more independent populations. Which of these tests would be appropriate?
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below.
Compute a 90% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24, and 59. Change the number from 59 to 24 and recalculate the confidence interval.
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