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Question: The U.C. Berkeley Wellness Encyclopedia (1991) contains the following statement in its discussion of HIV testing: "In a high-risk population, virtually all people who test positive will truly be infected, but among people at low risk the false positives will outnumber the true positives. Thus, for every infected person correctly identified in a low-risk population, an estimated ten noncarriers [of the HIV virus] will test positive" (p. 360).
a. Suppose you have a friend who is part of this low-risk population but who has just tested positive. Using the numbers in the statement, calculate the probability that the person actually carries the virus.
b. Your friend is understandably upset and doesn't believe that the probability of being infected with HIV isn't really near 1. After all, the test is accurate and it came out positive. Explain to your friend how the Wellness Encyclopedia statement can be true, even though the test is very accurate both for people with HIV and for people who don't carry it. If it's easier, you can make up numbers to put in a table to support your argument.
1.Find a peer-reviewed article that provides an example of a study where the researchers utilized linear regression. Briefly describe the study and discuss its findings in your own words.
Determine the variance of firm's profit for the month.
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Following changes in the airline industry, marked by reduced fares and other factors, the airline management wanted to check whether the proportion of frequent.
an estimate of a population parameter that provides an interval of values believed to contain the value of the
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In Eurelia there are three categories of bicycle license, with different fees for each. The table below is based on a random sample of 122 Eurelian bicycle-license holders.
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
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