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The ELISA test for AIDS was used in the screening of blood donations in the 1990s. As with most medical diagnostic tests, the ELISA test is not infallible. If a person actually carries the AIDS virus, experts estimate that this test gives a positive result 97.7% of the time. If a person does not carry the AIDS virus, ELISA gives a negative result 92.6% of the time. Experts also estimate that 0.5% of the American public carries the AIDS virus.
Suppose that someone tells you that they have tested positive. Given this information, what is the probability that the person actually carries the AIDS virus?
Find the critical t-value that corresponds to 90% confidence. Assume 90 degrees of freedom.
What measure of central tendency is most sensitive to skewness and which is least sensitive? What are measures of central tendency used for? What are measures of dispersion used for?
Find the value of the standard normal random variable z, called z 0 such that:
Identify the indicated values or interpret the given display. In a survey of 703 randomly selected workers,
A hypothesis test is to be used to help determine if there is a difference between the proportion of 2 year college students and private university students that work at least 20 hours per week.
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
As a manager of an organization, what statistics would you use and why if you wanted to estimate your annual employee turnover? Be sure to specifically identify the statistical formulas and what additional data you would need to determine your est..
If two registered voters are selected at random, what is the probability exactly one voter is a democrat?
What proportion of sample means would be between 1.31 and 1.33 inches?
A research report summarizes the results of the hypothesis test by stating,"z = 2.13, p
The hospital tests five vials from each shipment. If at least one of the five is ineffective, find the conditional probability pf that shipment's having come from C.
Most businesses use some form of linear regression in forecasting future conditions. Give an example of the use of regression analysis at your organization. What were the independent and dependent variables?
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