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The mortality experience of 8146 male employees of a research engineering and metal fabrication plant in New York, was studied from 1946-1981. Potential workplace exposures included welding fumes, cutting oils, asbestos, organic solvents, and environmental ionizing radiation, as a result of waste disposal during the Manhattan project in World War II. Comparisons were made for specific causes of death between mortality rates in workers and U.S white male mortality rates from 1950-1978.
Suppose that 17 deaths from cirrhosis of the liver were observed among workers who were hired prior to 1946 and who had worked in the plant for 10 or more years, whereas 6.3 were expected based on US white-male mortality rates.
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p- value.
Calculate the mean, mode and median of the grouped data derived from the frequency distribution above. Compare the results obtained from
For what proportion of patients will drug be effective for between 2 and 2.25 hours?
At significance levels of .05 and .01 test H 0 : the factors A and B are independent.
When planning the new baseball stadium for Washington DC, you are asked to find the break-even point for the number of luxury skyboxes built.
In teaching the role of statistical application in Health Science, the importance of reliable and valid data is very critical in research process.
Find out best decision, by using following decision criteria.
The weight of the first orange minus the weight of the second orange) is a random variable with standard deviation and individual outcomes are uncertain but happen in a predictable manner through time.
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
Let independent variable x represent years since 1950. Determine quadratic regression model for per capita cigarette consumption.
Find out which (t-, z- or neither) distribution is suitable Then if you can utilize either a t- or z- distribution, provide associated critical value (critical t- or z- score) from that distribution to reach given confidence level.
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 30.
Let us speek where the preceding data are representative of the entire sector of retail sales companiesSuppose the annual profits are more than 6.5 thousand $ every employee.
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