introduction: lead is one of the heavy metals that have adverse effects on blood cellsand hemopoiesis. in this study the ultrastructure of neutrophils in fetal rat spleen wereinvestigated following lead intoxication. material and methods: thirty female and 6 male sprague-dawley rats were chosenby simple random sampling. after mating the pregnant rats were classified into test and controlgroups....

We propose a new approach to the estimation of join selectivity. The technique, which we have called “systematic sampling”, is a novel variant of the sampling-based approach. Systematic sampling works as follows: Given a relation R of N tuples, with a join attribute that can be accessed in ascending/descending order via an index, if n is the number of tuples to be sampled from R, select a tuple...

In this paper, we have considered that ranked set sampling is able to estimate the parameters of exponentiated Pareto distribution. The method with which maximum likelihood estimators for distribution studied numerical since there no presence or possibility a closed-form at hands any other intellectual. approach well-suited one study as has been struggles in achieving it technique. order compar...

the purpose of this study was to compare symptoms of ptsd among war affected people and employees in the fire station. totally, 60 people affected by war and 60 fire workers were selected using simple random sampling. by completing pcl inventory, samples of ptsd were characterized. data was analysed through spss software by independent t-test. as the results showed, severity of ptsd symptoms am...

Supporting sampling in the presence of joins is an important problem in data analysis. Pushing down the sampling operator through both sides of the join is inherently challenging due to data skew and correlation issues between output tuples. Joining simple random samples of base relations typically leads to results that are non-random. Current solutions to this problem perform biased sampling o...

background: coronary artery bypass graft (cabg) surgery is very traumatic and makes patients very nervous. since it is a main task of nurses to improve patients' comfort and safety, this study investigated the effect of therapeutic touch in cardiovascular patients' anxiety before cabg surgery. methods: in a controlled clinical trail study the simple random sampling was used to select 44 patient...