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Many investigators have studied the relationship between asbestos exposure and death from chronic obstructive pulmonary disease (COPD).
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?
Citrus Rental is a popular car rental agency that has a history of having too few cars available, so that its available cars are overdriven. The mean monthly mileage over the years for Citrus cars has been about 1550 miles per month.
He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
The Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
A state survey investigates either the proportion of 8percent for employees who commute by car to work is higher than it was five years ago.
The probability that an individual is left-handed is 0.1. In a class of 30 students, what is the probability of finding at least five left-handers?
Determine the probability of randomly selecting 10 production employees on hot summer day and determining that none of them are absent?
The distinction between sampling with replacement and sampling without replacement. Many surveys use the census as a sampling frame. Any bias in this frame?
Many people do not "like" or "trust" single point estimates for things they need measured.
A random sample of size 16 is chosen from a population and a 90% confidence interval for the standard deviation will be determined. What value of should be located in the chi-square distribution table?
Based upon all of this information, do a "goodness-of-fit" test to see if the distributions are the same as they were two years ago. Use a level of confidence of .01. Should we accept Ho or reject Ho?
Incomes in the thousands of dollars were sampled in one region, they are as follows (1.5, 3.0, 4.2, 5.6, 2.6, 4.1, 0.9, 5.7, 5.4, 2.6) Assume the population is normal.
Which regression method would you use and why? What would the output tell you about the relationship between the variables and what would R2 and adjusted R2 tell you about the relationship between the variables?
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