Indicative of problems
A certain diagnostic test is indicative of problems only if a child scores in the lowest 10% of all those taking the test. If the mean score is 150 with a standard deviation of 30, what would the diagnostically meaningful cutoff be?
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The alkalinity level of water specimens collected from the Han River in Seoul, Korea, has a mean of 50 milligrams per liter and a standard deviation of 3.2 milligrams per liter.
Electrical engineers recognize that high neutral current in computer power system is a potential problem. A recent survey of computer power system load currents a U.S.sites found that 10% of the sites had high neutral to full-load current ratios.
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Suppose you want to estimate a population proportion, p and p = 0.35, N=5,600, and n= 1,800. Find an approximate 95% confidence interval for p.
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An automobile manufacturer obtains the microprocessors used to regulate fuel consumption in its automobiles from three microelectronic firms: A, B, and C. The quality-control department of the company has determined that 2% of the microprocessors
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