Quite Imposing 4 Serial 143

[Gemma Tuner]

Multi-phase sampling is quite different from multistage sampling, despite the similarity of their names. Although multi-phase sampling also involves taking two or more samples, all samples are drawn from the same frame. Selection of a unit in the second phase is conditional to its selection in the first phase. A unit not selected in the first phase will not be part of the second-phase sample. Like for multistage sampling, the more phases used, the more complex the sample design and estimation.

Filling out questionnaires or interviewing participants are relatively inexpensive procedures, but the medical tests require the supervision and assistance of a trained health practitioner, as well as the use of an equipped laboratory, both of which can be quite costly. The best way to conduct this survey would be to use a two-phase sample approach. In the first phase, the interviews are performed on an appropriately sized sample. From this sample, a smaller sample is drawn. Only participants selected in the second sample would take part in the medical tests.

Quite Imposing 4 Serial 143
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The question, however, is how to differentiate between simple and complex arithmetic. Where is the line dividing them? Thus, although counting can be considered, a priori, to be a quite simple task, the fact that it requires more WM resources than does subitizing (Tuholski et al., 2001) might be enough to consider it as being more complex. In this sense, the fact that differences between math-anxious groups emerged for the complex task (i.e., counting; more WM demanding) but not for the simple one (i.e., subitizing; less WM demanding) could indeed give support to the anxiety-complexity effect proposed by Ashcraft and colleagues.
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