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Enzyme immunoassay (EIA) tests are used to screen blood specimens for the presence of antibodies to HIV, the virus that causes AIDS. Antibodies indicate the presence of the virus. The test is quite accurate but is not always correct. Here are approximate probabilities of positive and negative EIA outcomes when the blood tested does and does not actually contain antibodies to HIV. (Centers for Disease Control and Prevention, 1998.) Test Result + - Antibodies present 0.9985 0.0015 Antibodies absent 0.006 0.994 Suppose that 1% of a large population carries antibodies to HIV in their blood. a. Blood donors are prescreened for HIV risk factos, so perhaps only 0.1% (0.001) of this population carries HIV antibodies. Find the probability that a person from this population has the antibody given that the EIA test is positive. b. Clients of a drug rehab clinic are a high-risk group, so perhaps 10% of this population carries HIV antibodies. Find the probability that a person from this population has the antibody given that the EIA test is positive. c. What general lesson do your calculations illustrate?
Montreal and ask them if they would be comfortable with a woman asking them out for a date. If the claim made by the study was true, what is the probability that At most 4 men would say no?
To findout the point estimate of the difference among population mean. Elucidate the percentage increase in the number of days on the disabled list.
If a technical breakthrough occurred that raised the profit per unit of X 1 to $3, would this affect the optimal solution?
You are reviewing a scientific study where the epidemiologists sampled 1000 people from Charleston, South Carolina and measured variation at two loci, A and B.
Graph inequality. Using the test point method.
An expert witness in a case of alleged racial discrimination in a state university school of nursing introduced a regression of the determinants of Salary of each professor for each year during an 8-year period (n = 423) with the following results, w..
To do this, he selects 16 bags of tortilla chips of this brand at random and determines the net weight of each. He finds a sample mean of 13.88 oz. with a standard deviation of s = 0.24 oz.
What is the significance of the picture at the top of the t-table? What is the difference between a sample parameter (X-bar and s) and a proportion parameter (n)?
Four percent of DVD players manufactured by an electronics company are defective. Suppose six DVD players are randomly selected from the production line. Each DVD player is determined to be defective or non-defective.
A company wants to determine if employees have any preferences among 5 different health plans. A sample of 200 employees provided the data below.
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
What percentage of 25-year-old mean are over 6 feet 2 inches tall? What percentage of men in the 6-footer club are over 6 foot 5 inches?
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