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Alkalinity of water. 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 (Environmental Science and Engineering, September 1, 2000).
Assume the distribution of alkalinity levels is approximately normal and find the probability that a water specimen collected from the river has an alkalinity level
(a) exceeding 45 milligrams per liter.
(b) below 55 milligrams per liter.
(c) between 51 and 52 milligrams per liter.
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Approximately 34% of all university professors are extroverted Suppose you have classes with 5 Different professors. Find probability that 1 is extroverted? Find probability that 2 are extroverted.
Historically, Stat 2480 students average 80 points on midterms. One section earned the following scores: 90, 78, 73, 62, 77, 75, 61, 63, 68, 78, 75, 80, 87, 73, 78, 75, 78, 88, 70. Assume the test scores for the section represent a random sample from..
Historical data suggests a standard deviation in the first sample of 10 and a standard deviation in the second sample of 16. Find a 95% confidence interval for the population difference.
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Find the closest point of the surface: xy + xz + yz = 1 to the origin.
1. in a simple bivariate regression with 60 observations there will be residualsa 60b 59c 58d 572. which is not an
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Which two types of probability sampling are best suited for business research and statistical data analysis, and why?
Find a 95 percent confidence interval for the population mean concentration of uric acid in this patients blood. The concentration of uric acid in this patient's blood.
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