Random意为:随意的,胡乱的,无目的的。与B项的 “不规律的抽查(Selecting…irregularly)”意思最接近。故选B项。A项“有目的检查学生的酒精含量。”与文中谈到的“青少年吸毒贩毒”不是一回事;C项“检测青少年罪犯是否吸毒。”检查的对象不是文中所讲的主要对象。D项“检查特殊的学生是否高兴”与文章主题相违背。
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rand function is used to perform random numbers, lets say you have a set of students you want them to have like a random drug test or something but you want it to be automated, you'll use the random to pick a certain id number that you will subject to the drug test. more over tha...
Working Life: What a Come-Down Could Random Drug Testing Cost You Your Job? Tobias Jones InvestigatesIF YOU ARE one of the millions of Britons who take Ecstasy on a Saturday night, or have the odd line of cocaine, or even just indulge in the occasional joint, you might be about to ...
Initial observation indicates that the drug is working. However, it is also possible that the observation may be due to chance. A t-test can be used to determine if the results are significant and applicable to the entire population, or whether they are random and not due to the drug inte...
It's used to provide evidence concerning the plausibility of the null hypothesis that hypothesizes that there's nothing more than random chance at work in the data. Statistical hypothesis testing is used to determine whether the result of a data set is statistically significant. ...
Are biosimilars the same as a generic? A biosimilar is not considered a “generic” in the same way that a traditional, small molecule drug (for example: ibuprofen or acetaminophen) is determined to be a generic. Biosimilars are "similar" because they are biologics that do not have to be ...
A coordinated, multifaceted security program is needed to mitigate the broad array of security risks found in supply chains. Supply Chain Security Threats Keeping a modern supply chain secure and running at optimal speed and cost is no small task. There is no shortage of threats that can have ...
If it is a double-blind trial, neither the patients nor the doctors know which group is which until the study is over. This type of study is designed to eliminate bias in both the patient and the observer, and the random assignment of drug vs. placebo is done via a computer program. ...
As of 2011, nearly all professional leagues had its athletes submit to random drug tests for anabolic steroids, narcotics, and common performance enhancers like androstenedione and human growth hormone. In the NFL, players are tested yearly for steroids and amphetamines. Violators get a mandatory fou...