نتایج جستجو برای: samples t test
تعداد نتایج: 1758428 فیلتر نتایج به سال:
There are several parameters that have significant influence in metal forming process. One of the most important of them is friction coefficient. Friction can change the pattern of metal flow and the force needed for deformation. It is necessary to determine the friction coefficient to study the effect of friction on metal forming process. This study is concerned with numerical and experimental...
BACKGROUND PCR has evolved into one of the most promising tools for T. cruzi detection in the diagnosis and control of Chagas disease. However, general use of the technique is hampered by its complexity and the lack of standardization. METHODOLOGY We here present the development and phase I evaluation of the T. cruzi OligoC-TesT, a simple and standardized dipstick format for detection of PCR ...
هدف کلی از اجرای این تحقیق بررسی تأثیر حاد و 24 ساعت بعد از یک جلسه پروتکل انتخابی ماساژ سنتی تای بر آزمون های عملکردی پرش عمودی و تست تعادل ستاره در زنان ورزشکار بود. تعداد 32 نفر آزمودنی با میانگین سن1/1±38/21 سال، قد 04/0±160 سانتیمتر، وزن 9/7±44/54 کیلوگرم و bmi 1/1±6/22 کیلوگرم بر متر مربع، از زنان دانشجوی دانشکده تربیت بدنی دانشگاه خوارزمی وارد مطالعه شدند. گروه تجربی به مدت یک ساعت در یک...
STUDY OBJECTIVE To explore how Student's t test, which assumes normal errors, is affected by the nonnormal distribution of Glasgow Coma Scale (GCS) scores. METHODS A sample of 145,295 GCS scores from the Pennsylvania Trauma Systems Foundation was assumed to represent the true GCS distribution. Four Monte Carlo simulations, each based on 40,000 replications, were conducted to approximate the d...
this study investigated the potential role of age in inductive and deductive grammar learning among iranian foreign language learners. the experimental population consisted of our randomly selected samples including two groups of children (with age of exposure to english within 8-13), and two groups of adults (with age of exposure to english within 11-13). thus, the comparison was between ch...
Payne and Jones (1957) presented a useful formula for estimating the abnormality of differences between an individual's scores on two tests. Extending earlier work by Sokal and Rohlf (1995) and Crawford and Howell (in press), we developed a modified paired samples t test as an alternative to this formula. Unlike the Payne and Jones formula, the new method treats data from a normative or control...
BACKGROUND Student's two-sample t test is generally used for comparing the means of two independent samples, for example, two treatment arms. Under the null hypothesis, the t test assumes that the two samples arise from the same normally distributed population with unknown variance. Adequate control of the Type I error requires that the normality assumption holds, which is often examined by mea...
This paper compares the type I error and power of the one- and two-sample t-tests, and the one- and two-sample permutation tests for detecting differences in gene expression between two microarray samples with replicates using Monte Carlo simulations. When data are generated from a normal distribution, type I errors and powers of the one-sample parametric t-test and one-sample permutation test ...
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