نتایج جستجو برای: t test
تعداد نتایج: 1424721 فیلتر نتایج به سال:
coincides with the standard (central) tν distribution. In the following, represents the effect size; by convention, a of 0.5 is considered a "medium" effect size. In Figure 1 are shown three instances of the t′ density envelope for ν = 10, one with δ = 0 (a standard t), and two with δ = 3 and δ = 6 : one may note that, whereas t10(δ = 0) is centered at 0 and symmetrical, the non-central t′’s ar...
عوامل زیادی در عملکرد آزمونی زبان آموزان در متن یادگیری زبان موثر می باشد.این تحقیق تلاشی است در زمینه بررسی نقشی که سبک های شناختی و شخصیتی بر عملکرد یادگیرنده های زبانی در سوالات c-test z-test و تست های چند گزینه ای دارد. در این تحقیق سعی شده است تا نقش درون گرایی، برون گرایی، تکانشی و فکری بودن بر روی عملکرد شرکت کنندگان در این آزمون ها بررسی شود. به منظور دستیابی این هدف 212 یادگیرنده زبان ...
گرچه در حوزه تاکید بر ساختار توجه وافری به نحو و لغات زبان شده است? اما آواشناسی زبان در تدریس زبان خارجی و تحقیق در مورد آن مورد غفلت واقع شده است. این پایان نامه در صدد پر کردن خلا ذکر شده در پیشینه تحقیق روش تدریس زبان انگیسی می باشد. تمییز آوایی بخشی از قابلیت آوایی زبان آموزان است. بنابر این? هدف این مطالعه کاوش در تاثیرات آموزش صریح و غیرصریح واجهای انگلیسی در بهبود توانایی زبان آموزان مب...
Many Six Sigma practitioners use “Student’s” independent two-sample t-test when investigating differences in means. This type of test is based upon drawing random samples from two independent normal (Gaussian) distributions. Often, however, the assumption of normality and/or random sampling is violated. This article discusses when and why the two-sample t-test may be considered robust to these ...
Five inferential methods employed in single-case studies to compare a case to controls are examined; all of these make use of a t-distribution. It is shown that three of these ostensibly different methods are in fact strictly equivalent and are not fit for purpose; they are associated with grossly inflated Type I errors (these exceed even the error rate obtained when a case's score is converted...
In clinical research, comparisons of the results from experimental and control groups are often encountered. The two-sample t-test (also called independent samples t-test) and the paired t-test are probably the most widely used tests in statistics for the comparison of mean values between two samples. However, confusion exists with regard to the use of the two test methods, resulting in their i...
within communicative, interactive, and learner-centered framework of language teaching and learning, students need to learn four skills of listening, speaking, reading, and writing for their educational success. but of all the language skills, reading enjoys a paramount significance in so many second or foreign language academic contexts. in spite of its importance, language learners still have...
several studies have shown that decidual tissue produces soluble factors which can mediate a variety of immunosuppressive activities. in order to assess whether prostaglandin e2 (pge2) was present in supernatants produced by explant culture of 10 human specimens of first trimester decidua. the effect of the supernatants from the two different series (with and without indomethacin treatment) of ...
adsorption isotherm modeling of phenol onto natural soils – applicability of various isotherm models
liquid-phases adsorption equilibrium of phenol onto two naturally available soils namely kalathur soil (kr) and adhanur soil (ar) were studied. the experimental data were analyzed using fourteen isotherm models, ranging from single-parametric model to multi-parametric models (up to 5 parameters) of the system. results show that in general the accuracy of models to fit experimental data improve...
This research assessed the effectiveness of interdisciplinary interventions involving physicians, pharmacists and nutritionists, aimed at the promotion of the Rational Use of Drugs. It is a study of a prospective and analytical nature conducted with a population of elderly females, where the effectiveness of the intervention was assessed according to indicators of the Rational Use of Drugs esta...
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