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Colormetric method is used to test lake water for nitrates. If water specimens contain nitrates, a solution dropped into the water will cause the specimen to turn red 95% of the time. When used on water specimens without nitrates, the solution causes water to turn red 10% of the time. A past lab study indicates that nitrates are contained in 30% of the water specimens that are sent to the lab for testing. If a water specimen is randomly selected and turns red when tested, calculate the probability that it actually contains nitrates. Use a tree diagram.
the following jobs are waiting to be processed at rick solans machine center. solans machine center has a relatively
The library is to be given 3 books as a gift. The books will be selected from a list of 16 titles. If each book selected must have a different title, how many possible selections are there.
use either the critical-value approach or the p-value approach to perform the required hypothesis test.independent
Millie and Senta Meter have recently taken Pre and Post test in achievement. The test were normally distributed. Millie's percentile rank changed from 57.93 to 77.34. Senta's changed from 1.07 to 4.95.
it is found that when a particular 4-sided die is rolled a 1 occurs 26.9 of the time a 2 occurs 23.8 of the time a 3
Great Plains Roofing and Siding Company inc, sells roofing and siding products to home repair retailers, such as Lowe's and Home Depot, and commercial contractors.
four out of every 10 online homes in the u.s. have switched to broadband high-speed internet. two homes are randomly
q1. a researcher wants to determine the sample size necessary to adequately conduct a study to estimate the population
Finds that 3 contain errors. If the accountant's theory is correct, what is the probability that at least 3 invoices contain errors in a random sample of 10?
a sample of 308 subscribers to wired magazine shows the mean time spent using the internet is 14.8 hours per week with
Does there appear to be a linear relationship between the screen size and the price?b. Which variable is the "dependent" variable?
a journal article reports that a sample of size 5 was used as a basis for calculating a 95 ci for the true average
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