This is a preview. Log in through your library . Abstract A type of population frequently encountered in extensive samplings is one in which the variance within a group of elements increases steadily ...

Systematic sampling means testing a hypothesis by taking several equally spaced items from a larger list, eg selecting the tenth, 20th and 30th visitor to a theme park. This can be particularly useful ...

Background: Potentially traumatic events happen in people's lives, leading to the risk of the development of posttraumatic stress disorder, depression and even suicide. Resilience is an individual's ...