نتایج جستجو برای: stratified random sampling method was used
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objective: the purpose of this study was to identify affecting factors on students’ environmental protection behavior (sipb). methods: statistical population of this research consisted of 1480 students in alborz agricultural technical higher education centers. a stratified random sampling method was used to select 145 student applying cochran's formula. the main tool to collect data was a resea...
in this study, a simple, rapid and selective method was developed for the determination of dexamethasone. the proposed method is based on inhibitory effect of dexamethasone on the oxidation of orange-g by bromate in sulfuric acid media. the reaction was followed spectrophotometrically at 478.5 nm (?max). under optimum experimental conditions, (72.6 ?mol l-1 of orange-g, 0.76 mol l-1 of h2so4, 0...
objectives: to determine the behavioral pattern of golestan university of medical science (gums) students as pedestrian and car occupants in relation to traffic law based on health belief model. methods: this cross-sectional study was performed during 2012 in gums. a total of 370 students of gums were selected using multi-stage sampling method including stratified and random sampling. data were...
the aim of this research was to study the effect of communication skills and interpersonal communication and their roles in the effectiveness of managers of sport organizations. the research was descriptive analytical and conducted through a survey. the population included 670 sport managers of iran sport organizations. the sample was selected by stratified random sampling method. questionnaire...
According to the statistical random sampling method, estimation has been taken confidence interval into account in statistics due to the unknown probability for the deviations of point estimate. In terms of fuzziness or vagueness, confidence interval is defined as a range of numerical values, not a single value, so we have to discover an estimate for that interval at first. Based on the above-m...
?it is of utmost priority for an experienced teacher to train the mind of the students, and enable them to think critically and correctly. the most important question here is that how to develop such a crucial ability? this study examines a new way to the development of critical thinking utilizing critical discourse analytical tools. to attain this goal, two classes of senior english la...
Estimates of erosion and sediment delivery have often relied on measurements from locations that were selected to be representative of particular terrain types. Such judgement samples are likely to overestimate or underestimate the mean of the quantity of interest. Probability sampling can eliminate the bias due to sample selection, and it permits the explicit expression of uncertainty with est...
In this article, we propose several quantization based stratified sampling methods to reduce the variance of a Monte-Carlo simulation. Theoretical aspects of stratification lead to a strong link between the problem of optimal Lquantization of a random variable and the variance reduction that can be achieved. We first emphasize on the consistency of quantization for designing strata in stratifie...
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