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Many investigators have studied the relationship between asbestos exposure and death from chronic obstructive pulmonary disease.
1) 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 excessive?
2) Twelve case of leukemia are reported in people living in a particular census tract over a 5 year period. Is the number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
Randomly selected statistics students were given five seconds to estimate the value of a product of numbers with a summary of the results of both groups given below.
A discussion of the ranges for the objective function coefficients. What do the ranges indicate about how sensitive the recommended solution is to HJ's exposure rating coefficients?
Suppose an airport scanning device has 98% accuracy in detecting certain kinds of metal objects (98% of people carrying these objects are correctly identified as carriers and 98% of people not carrying them are correctly identified as non-carriers..
How many cars must be randomly selected and tested in order to estimate the mean braking distance of registered cars in the United States.
Using the empirical rule, what is the approximate percentage of women between 156cm and 166cm? Using Chebyshev's Theorem, at least what percentage of women are between 149cm and 173cm?
Critically discuss the concept of the normal distribution, why it is important, and what you think it means. When students talk about "grading on the curve," how does that apply to the normal distribution?
The manufacturer would like to establish inventory levels such that there is only a five percent chance of running out of stock. Where should the manufacturer set the inventory level?
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
He further recalled that Watson had heard the victim scream "No, Percy!" moments before the tragic murder. Holmes concluded that Major Bretton had killed Davidson. Inductive or Deductive?
Yielding a sample mean of 190.7 days and a sample standard deviation of 54.2 days. Estimate the true mean population of the growing season with 95% confidence.
A sample of 81 account balances of a credit company showed an average balance of $1,200 with a sample standard deviation of $126. You want to determine if the mean of all account balances is significantly different from $1,250. Use a .05 level of ..
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
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