What is the prevalence of the disease
A screening test shows a positive result in 95% of all cases when disease is present and in 20% of all cases when it is not. When adminestered to a large number of people, 21.5% of the results were positive. What is the prevalence of the disease?
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Suppose that in front of a hotel in a large city, successive 20 second intervals constitute independent trials, in which either a single cab will arrive (with probability 0.2), or no cabs will arrive (with probability 0.8). Find the probability th
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A solution contains 0.050 M Ba2+ and 0.050 MCa2+. A solution containing fluoride ions is added to selectively precipitate one of the ions. At what concentration offluoride ions will a precipitate begin to form?
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