منابع مشابه
Testing Based on Two Samples
Let us consider a problem in which random samples are available from two normal distributions. The problem is to determine whether the means of the two distributions are equal. Specifically, we assume that the random variables X1, · · · , Xm form a random sample of size m from a normal distribution for which both the mean μ1 and the variance σ 2 1 are unknown; and that the variables Y1, · · · ,...
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Tests designed to detect increasing hazard ratio against the proportional hazards hypothesis are generally consistent for other alternatives also. This article provides a test of the null hypothesis of increasing hazard ratio. The test is based on the separation between an empirical version of the relative trend function and its greatest convex minorant. The proportional hazards model, the leas...
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We report the first detection of tetrodotoxins (TTX) in European bivalve shellfish. We demonstrate that TTX is present within the temperate waters of the United Kingdom, along the English Channel, and can accumulate in filter-feeding molluscs. The toxin is heat-stable and thus it cannot be eliminated during cooking. While quantified concentrations were low in comparison to published minimum let...
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چکیده پلاتین، فلزی نجیب، پایدار و گران قیمت با خاصیت کاتالیزوری زیاد است که کاربرد های صنعتی فراوانی دارد. کمپلکس های پلاتین(ii) به عنوان دارو های ضد سرطان شناخته شدند و در شیمی درمانی بیماران سرطانی کاربرد دارند. خاصیت کاتالیزوری و عملکرد گزینشی پلاتین مستقیماً به اندازه و- شکل ماده ی پلاتینی بستگی دارد. بعضی از نانو ذرات فلزی در سطح مشترک مایع- مایع سنتز شده اند، اما نانو ساختار های پلاتین ب...
Two Independent Samples
One of the most commonly used statistical techniques is the comparison of two independent samples of measurement data. More specifically, the comparison of the means of two independent samples. This is often the basis for making a decision to go with a particular method, process or supplier. The validity of the procedure hinges on the random selection of items for each sample. The correctness o...
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ژورنال
عنوان ژورنال: Nature
سال: 1953
ISSN: 0028-0836,1476-4687
DOI: 10.1038/172553a0