The method involves the use of 3D laser scanning, as a means of measuring helmet standoff distance (distance between the inside of the helmet and the skull), and the selection of a representative sample of test subjects.
A potential flaw in this study is that we saw an unexpectedly high pregnancy rate in the test group including a large number of pregnancies before the start of the study, and therefore, to reduce any weakness in the study population, we implemented an additional bias recruitment to ensure that there was a representative sample of test users who did not achieve a pregnancy at the end of the study.
In the United States, a similar number of students from across the country were selected as a representative sample for the test.
By the mid-1990s Bolivia had implemented achievement tests in a representative sample of primary schools, but those tests ceased in the mid-2000s.
Plasma and breast milk HIV load was also measured for a representative sample of women who tested HIV positive at baseline.
The latest Timss study, the world's largest review of math and science achievement, involved testing a representative sample of students in each country in 2007, the first time the tests had been administered since 2003.
Since 2002, the European Union has required that each Member State must test a representative sample of its sheep population to monitor scrapie prevalence [ 1].
The work reported on in this paper rests on the assumptions that the 134 children who volunteered to participate in the tests are a representative sample of the population and that the four aforementioned tests sufficiently capture the learning abilities of the participating children.
Self-reporting indeed will give lower incidence rates than studies relying on repeated testing (fasting blood glucose or oral glucose tolerance test) of a representative sample of the whole population of an area.
The treating process was designed after having analyzed and tested a representative sample coming from the whole amount of spent batteries collected in 1 month by the public service in and around Turin.
But it has some big implications not only for Mr Bush's much-maligned claim that he is a different sort of conservative, but also for the future health of American society.The National Assessment of Educational Progress has been periodically testing a representative sample of 9-, 13- and 17-year-olds since the early 1970s.
