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.
On the basis of these figures, a friend claims that the Right-to-Work laws are costing the average worker 50 cents per hour. Do you think this claim is justified? Assume a 5% level of significance.
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.
A student has submitted a concrete cylinder to the "strength contest" in Engineering Open House. Suppose the strength of her concrete cylinder is lognormally distributed with mean and standard deviation of 100 kips and 20 kips, respectively.
The athletic director claims that the attendance is the same as last year. If a = .05, what are the critical values for this two-tailed t test?
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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